Calculus Examples

$3 {(x^{2} + y^{2})}^{2} = 25 (x^{2} - y^{2})$ ; $(2, 1)$

Step 1

Find the first derivative and evaluate at $x = 2$ and $y = 1$ to find the slope of the tangent line.

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Step 1.1

Differentiate both sides of the equation.

$\frac{d}{d x} (3 {(x^{2} + y^{2})}^{2}) = \frac{d}{d x} (25 (x^{2} - y^{2}))$

Step 1.2

Differentiate the left side of the equation.

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Step 1.2.1

Since $3$ is constant with respect to $x$ , the derivative of $3 {(x^{2} + y^{2})}^{2}$ with respect to $x$ is $3 \frac{d}{d x} [{(x^{2} + y^{2})}^{2}]$ .

$3 \frac{d}{d x} [{(x^{2} + y^{2})}^{2}]$

Step 1.2.2

Differentiate using the chain rule, which states that $\frac{d}{d x} [f (g (x))]$ is $f' (g (x)) g' (x)$ where $f (x) = x^{2}$ and $g (x) = x^{2} + y^{2}$ .

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Step 1.2.2.1

To apply the Chain Rule, set $u_{1}$ as $x^{2} + y^{2}$ .

$3 (\frac{d}{d u_{1}} [{u_{1}}^{2}] \frac{d}{d x} [x^{2} + y^{2}])$

Step 1.2.2.2

Differentiate using the Power Rule which states that $\frac{d}{d u_{1}} [{u_{1}}^{n}]$ is $n {u_{1}}^{n - 1}$ where $n = 2$ .

$3 (2 u_{1} \frac{d}{d x} [x^{2} + y^{2}])$

Step 1.2.2.3

Replace all occurrences of $u_{1}$ with $x^{2} + y^{2}$ .

$3 (2 (x^{2} + y^{2}) \frac{d}{d x} [x^{2} + y^{2}])$

Step 1.2.3

Differentiate.

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Step 1.2.3.1

Multiply $2$ by $3$ .

$6 ((x^{2} + y^{2}) \frac{d}{d x} [x^{2} + y^{2}])$

Step 1.2.3.2

By the Sum Rule, the derivative of $x^{2} + y^{2}$ with respect to $x$ is $\frac{d}{d x} [x^{2}] + \frac{d}{d x} [y^{2}]$ .

$6 (x^{2} + y^{2}) (\frac{d}{d x} [x^{2}] + \frac{d}{d x} [y^{2}])$

Step 1.2.3.3

Differentiate using the Power Rule which states that $\frac{d}{d x} [x^{n}]$ is $n x^{n - 1}$ where $n = 2$ .

$6 (x^{2} + y^{2}) (2 x + \frac{d}{d x} [y^{2}])$

Step 1.2.4

Differentiate using the chain rule, which states that $\frac{d}{d x} [f (g (x))]$ is $f' (g (x)) g' (x)$ where $f (x) = x^{2}$ and $g (x) = y$ .

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Step 1.2.4.1

To apply the Chain Rule, set $u_{2}$ as $y$ .

$6 (x^{2} + y^{2}) (2 x + \frac{d}{d u_{2}} [{u_{2}}^{2}] \frac{d}{d x} [y])$

Step 1.2.4.2

Differentiate using the Power Rule which states that $\frac{d}{d u_{2}} [{u_{2}}^{n}]$ is $n {u_{2}}^{n - 1}$ where $n = 2$ .

$6 (x^{2} + y^{2}) (2 x + 2 u_{2} \frac{d}{d x} [y])$

Step 1.2.4.3

Replace all occurrences of $u_{2}$ with $y$ .

$6 (x^{2} + y^{2}) (2 x + 2 y \frac{d}{d x} [y])$

Step 1.2.5

Rewrite $\frac{d}{d x} [y]$ as $y'$ .

$6 (x^{2} + y^{2}) (2 x + 2 y y')$

Step 1.2.6

Simplify.

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Step 1.2.6.1

Apply the distributive property.

$(6 x^{2} + 6 y^{2}) (2 x + 2 y y')$

Step 1.2.6.2

Reorder the factors of $(6 x^{2} + 6 y^{2}) (2 x + 2 y y')$ .

$(2 x + 2 y y') (6 x^{2} + 6 y^{2})$

Step 1.3

Differentiate the right side of the equation.

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Step 1.3.1

Differentiate.

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Step 1.3.1.1

Since $25$ is constant with respect to $x$ , the derivative of $25 (x^{2} - y^{2})$ with respect to $x$ is $25 \frac{d}{d x} [x^{2} - y^{2}]$ .

$25 \frac{d}{d x} [x^{2} - y^{2}]$

Step 1.3.1.2

By the Sum Rule, the derivative of $x^{2} - y^{2}$ with respect to $x$ is $\frac{d}{d x} [x^{2}] + \frac{d}{d x} [- y^{2}]$ .

$25 (\frac{d}{d x} [x^{2}] + \frac{d}{d x} [- y^{2}])$

Step 1.3.1.3

Differentiate using the Power Rule which states that $\frac{d}{d x} [x^{n}]$ is $n x^{n - 1}$ where $n = 2$ .

$25 (2 x + \frac{d}{d x} [- y^{2}])$

Step 1.3.1.4

Since $- 1$ is constant with respect to $x$ , the derivative of $- y^{2}$ with respect to $x$ is $- \frac{d}{d x} [y^{2}]$ .

$25 (2 x - \frac{d}{d x} [y^{2}])$

Step 1.3.2

Differentiate using the chain rule, which states that $\frac{d}{d x} [f (g (x))]$ is $f' (g (x)) g' (x)$ where $f (x) = x^{2}$ and $g (x) = y$ .

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Step 1.3.2.1

To apply the Chain Rule, set $u$ as $y$ .

$25 (2 x - (\frac{d}{d u} [u^{2}] \frac{d}{d x} [y]))$

Step 1.3.2.2

Differentiate using the Power Rule which states that $\frac{d}{d u} [u^{n}]$ is $n u^{n - 1}$ where $n = 2$ .

$25 (2 x - (2 u \frac{d}{d x} [y]))$

Step 1.3.2.3

Replace all occurrences of $u$ with $y$ .

$25 (2 x - (2 y \frac{d}{d x} [y]))$

Step 1.3.3

Multiply $2$ by $- 1$ .

$25 (2 x - 2 (y \frac{d}{d x} [y]))$

Step 1.3.4

Rewrite $\frac{d}{d x} [y]$ as $y'$ .

$25 (2 x - 2 y y')$

Step 1.3.5

Simplify.

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Step 1.3.5.1

Apply the distributive property.

$25 (2 x) + 25 (- 2 y y')$

Step 1.3.5.2

Combine terms.

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Step 1.3.5.2.1

Multiply $2$ by $25$ .

$50 x + 25 (- 2 y y')$

Step 1.3.5.2.2

Multiply $- 2$ by $25$ .

$50 x - 50 y y'$

Step 1.3.5.3

Reorder terms.

$- 50 y y' + 50 x$

Step 1.4

Reform the equation by setting the left side equal to the right side.

$(2 x + 2 y y') (6 x^{2} + 6 y^{2}) = - 50 y y' + 50 x$

Step 1.5

Solve for $y'$ .

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Step 1.5.1

Simplify $(2 x + 2 y y') (6 x^{2} + 6 y^{2})$ .

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Step 1.5.1.1

Rewrite.

$0 + 0 + (2 x + 2 y y') (6 x^{2} + 6 y^{2}) = - 50 y y' + 50 x$

Step 1.5.1.2

Simplify by adding zeros.

$(2 x + 2 y y') (6 x^{2} + 6 y^{2}) = - 50 y y' + 50 x$

Step 1.5.1.3

Expand $(2 x + 2 y y') (6 x^{2} + 6 y^{2})$ using the FOIL Method.

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Step 1.5.1.3.1

Apply the distributive property.

$2 x (6 x^{2} + 6 y^{2}) + 2 y y' (6 x^{2} + 6 y^{2}) = - 50 y y' + 50 x$

Step 1.5.1.3.2

Apply the distributive property.

$2 x (6 x^{2}) + 2 x (6 y^{2}) + 2 y y' (6 x^{2} + 6 y^{2}) = - 50 y y' + 50 x$

Step 1.5.1.3.3

Apply the distributive property.

$2 x (6 x^{2}) + 2 x (6 y^{2}) + 2 y y' (6 x^{2}) + 2 y y' (6 y^{2}) = - 50 y y' + 50 x$

Step 1.5.1.4

Simplify each term.

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Step 1.5.1.4.1

Rewrite using the commutative property of multiplication.

$2 \cdot 6 x \cdot x^{2} + 2 x (6 y^{2}) + 2 y y' (6 x^{2}) + 2 y y' (6 y^{2}) = - 50 y y' + 50 x$

Step 1.5.1.4.2

Multiply $x$ by $x^{2}$ by adding the exponents.

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Step 1.5.1.4.2.1

Move $x^{2}$ .

$2 \cdot 6 (x^{2} x) + 2 x (6 y^{2}) + 2 y y' (6 x^{2}) + 2 y y' (6 y^{2}) = - 50 y y' + 50 x$

Step 1.5.1.4.2.2

Multiply $x^{2}$ by $x$ .

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Step 1.5.1.4.2.2.1

Raise $x$ to the power of $1$ .

$2 \cdot 6 (x^{2} x^{1}) + 2 x (6 y^{2}) + 2 y y' (6 x^{2}) + 2 y y' (6 y^{2}) = - 50 y y' + 50 x$

Step 1.5.1.4.2.2.2

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$2 \cdot 6 x^{2 + 1} + 2 x (6 y^{2}) + 2 y y' (6 x^{2}) + 2 y y' (6 y^{2}) = - 50 y y' + 50 x$

Step 1.5.1.4.2.3

Add $2$ and $1$ .

$2 \cdot 6 x^{3} + 2 x (6 y^{2}) + 2 y y' (6 x^{2}) + 2 y y' (6 y^{2}) = - 50 y y' + 50 x$

Step 1.5.1.4.3

Multiply $2$ by $6$ .

$12 x^{3} + 2 x (6 y^{2}) + 2 y y' (6 x^{2}) + 2 y y' (6 y^{2}) = - 50 y y' + 50 x$

Step 1.5.1.4.4

Rewrite using the commutative property of multiplication.

$12 x^{3} + 2 \cdot 6 x y^{2} + 2 y y' (6 x^{2}) + 2 y y' (6 y^{2}) = - 50 y y' + 50 x$

Step 1.5.1.4.5

Multiply $2$ by $6$ .

$12 x^{3} + 12 x y^{2} + 2 y y' (6 x^{2}) + 2 y y' (6 y^{2}) = - 50 y y' + 50 x$

Step 1.5.1.4.6

Multiply $6$ by $2$ .

$12 x^{3} + 12 x y^{2} + 12 y y' x^{2} + 2 y y' (6 y^{2}) = - 50 y y' + 50 x$

Step 1.5.1.4.7

Multiply $y$ by $y^{2}$ by adding the exponents.

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Step 1.5.1.4.7.1

Move $y^{2}$ .

$12 x^{3} + 12 x y^{2} + 12 y y' x^{2} + 2 (y^{2} y) y' \cdot 6 = - 50 y y' + 50 x$

Step 1.5.1.4.7.2

Multiply $y^{2}$ by $y$ .

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Step 1.5.1.4.7.2.1

Raise $y$ to the power of $1$ .

$12 x^{3} + 12 x y^{2} + 12 y y' x^{2} + 2 (y^{2} y^{1}) y' \cdot 6 = - 50 y y' + 50 x$

Step 1.5.1.4.7.2.2

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$12 x^{3} + 12 x y^{2} + 12 y y' x^{2} + 2 y^{2 + 1} y' \cdot 6 = - 50 y y' + 50 x$

Step 1.5.1.4.7.3

Add $2$ and $1$ .

$12 x^{3} + 12 x y^{2} + 12 y y' x^{2} + 2 y^{3} y' \cdot 6 = - 50 y y' + 50 x$

Step 1.5.1.4.8

Multiply $6$ by $2$ .

$12 x^{3} + 12 x y^{2} + 12 y y' x^{2} + 12 y^{3} y' = - 50 y y' + 50 x$

Step 1.5.2

Add $50 y y'$ to both sides of the equation.

$12 x^{3} + 12 x y^{2} + 12 y y' x^{2} + 12 y^{3} y' + 50 y y' = 50 x$

Step 1.5.3

Move all terms not containing $y'$ to the right side of the equation.

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Step 1.5.3.1

Subtract $12 x^{3}$ from both sides of the equation.

$12 x y^{2} + 12 y y' x^{2} + 12 y^{3} y' + 50 y y' = 50 x - 12 x^{3}$

Step 1.5.3.2

Subtract $12 x y^{2}$ from both sides of the equation.

$12 y y' x^{2} + 12 y^{3} y' + 50 y y' = 50 x - 12 x^{3} - 12 x y^{2}$

Step 1.5.4

Factor $2 y y'$ out of $12 y y' x^{2} + 12 y^{3} y' + 50 y y'$ .

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Step 1.5.4.1

Factor $2 y y'$ out of $12 y y' x^{2}$ .

$2 y y' (6 x^{2}) + 12 y^{3} y' + 50 y y' = 50 x - 12 x^{3} - 12 x y^{2}$

Step 1.5.4.2

Factor $2 y y'$ out of $12 y^{3} y'$ .

$2 y y' (6 x^{2}) + 2 y y' (6 y^{2}) + 50 y y' = 50 x - 12 x^{3} - 12 x y^{2}$

Step 1.5.4.3

Factor $2 y y'$ out of $50 y y'$ .

$2 y y' (6 x^{2}) + 2 y y' (6 y^{2}) + 2 y y' \cdot 25 = 50 x - 12 x^{3} - 12 x y^{2}$

Step 1.5.4.4

Factor $2 y y'$ out of $2 y y' (6 x^{2}) + 2 y y' (6 y^{2})$ .

$2 y y' (6 x^{2} + 6 y^{2}) + 2 y y' \cdot 25 = 50 x - 12 x^{3} - 12 x y^{2}$

Step 1.5.4.5

Factor $2 y y'$ out of $2 y y' (6 x^{2} + 6 y^{2}) + 2 y y' \cdot 25$ .

$2 y y' (6 x^{2} + 6 y^{2} + 25) = 50 x - 12 x^{3} - 12 x y^{2}$

Step 1.5.5

Divide each term in $2 y y' (6 x^{2} + 6 y^{2} + 25) = 50 x - 12 x^{3} - 12 x y^{2}$ by $2 y (6 x^{2} + 6 y^{2} + 25)$ and simplify.

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Step 1.5.5.1

Divide each term in $2 y y' (6 x^{2} + 6 y^{2} + 25) = 50 x - 12 x^{3} - 12 x y^{2}$ by $2 y (6 x^{2} + 6 y^{2} + 25)$ .

$\frac{2 y y' (6 x^{2} + 6 y^{2} + 25)}{2 y (6 x^{2} + 6 y^{2} + 25)} = \frac{50 x}{2 y (6 x^{2} + 6 y^{2} + 25)} + \frac{- 12 x^{3}}{2 y (6 x^{2} + 6 y^{2} + 25)} + \frac{- 12 x y^{2}}{2 y (6 x^{2} + 6 y^{2} + 25)}$

Step 1.5.5.2

Simplify the left side.

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Step 1.5.5.2.1

Cancel the common factor of $2$ .

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Step 1.5.5.2.1.1

Cancel the common factor.

Step 1.5.5.2.1.2

Rewrite the expression.

$\frac{y y' (6 x^{2} + 6 y^{2} + 25)}{y (6 x^{2} + 6 y^{2} + 25)} = \frac{50 x}{2 y (6 x^{2} + 6 y^{2} + 25)} + \frac{- 12 x^{3}}{2 y (6 x^{2} + 6 y^{2} + 25)} + \frac{- 12 x y^{2}}{2 y (6 x^{2} + 6 y^{2} + 25)}$

Step 1.5.5.2.2

Cancel the common factor of $y$ .

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Step 1.5.5.2.2.1

Cancel the common factor.

Step 1.5.5.2.2.2

Rewrite the expression.

$\frac{y' (6 x^{2} + 6 y^{2} + 25)}{6 x^{2} + 6 y^{2} + 25} = \frac{50 x}{2 y (6 x^{2} + 6 y^{2} + 25)} + \frac{- 12 x^{3}}{2 y (6 x^{2} + 6 y^{2} + 25)} + \frac{- 12 x y^{2}}{2 y (6 x^{2} + 6 y^{2} + 25)}$

Step 1.5.5.2.3

Cancel the common factor of $6 x^{2} + 6 y^{2} + 25$ .

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Step 1.5.5.2.3.1

Cancel the common factor.

Step 1.5.5.2.3.2

Divide $y'$ by $1$ .

$y' = \frac{50 x}{2 y (6 x^{2} + 6 y^{2} + 25)} + \frac{- 12 x^{3}}{2 y (6 x^{2} + 6 y^{2} + 25)} + \frac{- 12 x y^{2}}{2 y (6 x^{2} + 6 y^{2} + 25)}$

Step 1.5.5.3

Simplify the right side.

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Step 1.5.5.3.1

Simplify each term.

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Step 1.5.5.3.1.1

Cancel the common factor of $50$ and $2$ .

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Step 1.5.5.3.1.1.1

Factor $2$ out of $50 x$ .

$y' = \frac{2 (25 x)}{2 y (6 x^{2} + 6 y^{2} + 25)} + \frac{- 12 x^{3}}{2 y (6 x^{2} + 6 y^{2} + 25)} + \frac{- 12 x y^{2}}{2 y (6 x^{2} + 6 y^{2} + 25)}$

Step 1.5.5.3.1.1.2

Cancel the common factors.

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Step 1.5.5.3.1.1.2.1

Factor $2$ out of $2 y (6 x^{2} + 6 y^{2} + 25)$ .

$y' = \frac{2 (25 x)}{2 (y (6 x^{2} + 6 y^{2} + 25))} + \frac{- 12 x^{3}}{2 y (6 x^{2} + 6 y^{2} + 25)} + \frac{- 12 x y^{2}}{2 y (6 x^{2} + 6 y^{2} + 25)}$

Step 1.5.5.3.1.1.2.2

Cancel the common factor.

$y' = \frac{2 (25 x)}{2 (y (6 x^{2} + 6 y^{2} + 25))} + \frac{- 12 x^{3}}{2 y (6 x^{2} + 6 y^{2} + 25)} + \frac{- 12 x y^{2}}{2 y (6 x^{2} + 6 y^{2} + 25)}$

Step 1.5.5.3.1.1.2.3

Rewrite the expression.

$y' = \frac{25 x}{y (6 x^{2} + 6 y^{2} + 25)} + \frac{- 12 x^{3}}{2 y (6 x^{2} + 6 y^{2} + 25)} + \frac{- 12 x y^{2}}{2 y (6 x^{2} + 6 y^{2} + 25)}$

Step 1.5.5.3.1.2

Cancel the common factor of $- 12$ and $2$ .

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Step 1.5.5.3.1.2.1

Factor $2$ out of $- 12 x^{3}$ .

$y' = \frac{25 x}{y (6 x^{2} + 6 y^{2} + 25)} + \frac{2 (- 6 x^{3})}{2 y (6 x^{2} + 6 y^{2} + 25)} + \frac{- 12 x y^{2}}{2 y (6 x^{2} + 6 y^{2} + 25)}$

Step 1.5.5.3.1.2.2

Cancel the common factors.

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Step 1.5.5.3.1.2.2.1

Factor $2$ out of $2 y (6 x^{2} + 6 y^{2} + 25)$ .

$y' = \frac{25 x}{y (6 x^{2} + 6 y^{2} + 25)} + \frac{2 (- 6 x^{3})}{2 (y (6 x^{2} + 6 y^{2} + 25))} + \frac{- 12 x y^{2}}{2 y (6 x^{2} + 6 y^{2} + 25)}$

Step 1.5.5.3.1.2.2.2

Cancel the common factor.

$y' = \frac{25 x}{y (6 x^{2} + 6 y^{2} + 25)} + \frac{2 (- 6 x^{3})}{2 (y (6 x^{2} + 6 y^{2} + 25))} + \frac{- 12 x y^{2}}{2 y (6 x^{2} + 6 y^{2} + 25)}$

Step 1.5.5.3.1.2.2.3

Rewrite the expression.

$y' = \frac{25 x}{y (6 x^{2} + 6 y^{2} + 25)} + \frac{- 6 x^{3}}{y (6 x^{2} + 6 y^{2} + 25)} + \frac{- 12 x y^{2}}{2 y (6 x^{2} + 6 y^{2} + 25)}$

Step 1.5.5.3.1.3

Move the negative in front of the fraction.

$y' = \frac{25 x}{y (6 x^{2} + 6 y^{2} + 25)} - \frac{6 x^{3}}{y (6 x^{2} + 6 y^{2} + 25)} + \frac{- 12 x y^{2}}{2 y (6 x^{2} + 6 y^{2} + 25)}$

Step 1.5.5.3.1.4

Cancel the common factor of $- 12$ and $2$ .

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Step 1.5.5.3.1.4.1

Factor $2$ out of $- 12 x y^{2}$ .

$y' = \frac{25 x}{y (6 x^{2} + 6 y^{2} + 25)} - \frac{6 x^{3}}{y (6 x^{2} + 6 y^{2} + 25)} + \frac{2 (- 6 x y^{2})}{2 y (6 x^{2} + 6 y^{2} + 25)}$

Step 1.5.5.3.1.4.2

Cancel the common factors.

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Step 1.5.5.3.1.4.2.1

Factor $2$ out of $2 y (6 x^{2} + 6 y^{2} + 25)$ .

$y' = \frac{25 x}{y (6 x^{2} + 6 y^{2} + 25)} - \frac{6 x^{3}}{y (6 x^{2} + 6 y^{2} + 25)} + \frac{2 (- 6 x y^{2})}{2 (y (6 x^{2} + 6 y^{2} + 25))}$

Step 1.5.5.3.1.4.2.2

Cancel the common factor.

$y' = \frac{25 x}{y (6 x^{2} + 6 y^{2} + 25)} - \frac{6 x^{3}}{y (6 x^{2} + 6 y^{2} + 25)} + \frac{2 (- 6 x y^{2})}{2 (y (6 x^{2} + 6 y^{2} + 25))}$

Step 1.5.5.3.1.4.2.3

Rewrite the expression.

$y' = \frac{25 x}{y (6 x^{2} + 6 y^{2} + 25)} - \frac{6 x^{3}}{y (6 x^{2} + 6 y^{2} + 25)} + \frac{- 6 x y^{2}}{y (6 x^{2} + 6 y^{2} + 25)}$

Step 1.5.5.3.1.5

Cancel the common factor of $y^{2}$ and $y$ .

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Step 1.5.5.3.1.5.1

Factor $y$ out of $- 6 x y^{2}$ .

$y' = \frac{25 x}{y (6 x^{2} + 6 y^{2} + 25)} - \frac{6 x^{3}}{y (6 x^{2} + 6 y^{2} + 25)} + \frac{y (- 6 x y)}{y (6 x^{2} + 6 y^{2} + 25)}$

Step 1.5.5.3.1.5.2

Cancel the common factors.

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Step 1.5.5.3.1.5.2.1

Cancel the common factor.

$y' = \frac{25 x}{y (6 x^{2} + 6 y^{2} + 25)} - \frac{6 x^{3}}{y (6 x^{2} + 6 y^{2} + 25)} + \frac{y (- 6 x y)}{y (6 x^{2} + 6 y^{2} + 25)}$

Step 1.5.5.3.1.5.2.2

Rewrite the expression.

$y' = \frac{25 x}{y (6 x^{2} + 6 y^{2} + 25)} - \frac{6 x^{3}}{y (6 x^{2} + 6 y^{2} + 25)} + \frac{- 6 x y}{6 x^{2} + 6 y^{2} + 25}$

Step 1.5.5.3.1.6

Move the negative in front of the fraction.

$y' = \frac{25 x}{y (6 x^{2} + 6 y^{2} + 25)} - \frac{6 x^{3}}{y (6 x^{2} + 6 y^{2} + 25)} - \frac{6 x y}{6 x^{2} + 6 y^{2} + 25}$

Step 1.5.5.3.2

To write $- \frac{6 x y}{6 x^{2} + 6 y^{2} + 25}$ as a fraction with a common denominator, multiply by $\frac{y}{y}$ .

$y' = - \frac{6 x^{3}}{y (6 x^{2} + 6 y^{2} + 25)} + \frac{25 x}{y (6 x^{2} + 6 y^{2} + 25)} - \frac{6 x y}{6 x^{2} + 6 y^{2} + 25} \cdot \frac{y}{y}$

Step 1.5.5.3.3

Write each expression with a common denominator of $y (6 x^{2} + 6 y^{2} + 25)$ , by multiplying each by an appropriate factor of $1$ .

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Step 1.5.5.3.3.1

Multiply $\frac{6 x y}{6 x^{2} + 6 y^{2} + 25}$ by $\frac{y}{y}$ .

$y' = - \frac{6 x^{3}}{y (6 x^{2} + 6 y^{2} + 25)} + \frac{25 x}{y (6 x^{2} + 6 y^{2} + 25)} - \frac{6 x y \cdot y}{(6 x^{2} + 6 y^{2} + 25) y}$

Step 1.5.5.3.3.2

Reorder the factors of $(6 x^{2} + 6 y^{2} + 25) y$ .

$y' = - \frac{6 x^{3}}{y (6 x^{2} + 6 y^{2} + 25)} + \frac{25 x}{y (6 x^{2} + 6 y^{2} + 25)} - \frac{6 x y \cdot y}{y (6 x^{2} + 6 y^{2} + 25)}$

Step 1.5.5.3.4

Combine the numerators over the common denominator.

$y' = - \frac{6 x^{3}}{y (6 x^{2} + 6 y^{2} + 25)} + \frac{25 x - 6 x y \cdot y}{y (6 x^{2} + 6 y^{2} + 25)}$

Step 1.5.5.3.5

Combine the numerators over the common denominator.

$y' = \frac{- 6 x^{3} + 25 x - 6 x y \cdot y}{y (6 x^{2} + 6 y^{2} + 25)}$

Step 1.5.5.3.6

Multiply $y$ by $y$ by adding the exponents.

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Step 1.5.5.3.6.1

Move $y$ .

$y' = \frac{- 6 x^{3} + 25 x - 6 x (y \cdot y)}{y (6 x^{2} + 6 y^{2} + 25)}$

Step 1.5.5.3.6.2

Multiply $y$ by $y$ .

$y' = \frac{- 6 x^{3} + 25 x - 6 x y^{2}}{y (6 x^{2} + 6 y^{2} + 25)}$

Step 1.5.5.3.7

Factor $x$ out of $- 6 x^{3} + 25 x - 6 x y^{2}$ .

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Step 1.5.5.3.7.1

Factor $x$ out of $- 6 x^{3}$ .

$y' = \frac{x (- 6 x^{2}) + 25 x - 6 x y^{2}}{y (6 x^{2} + 6 y^{2} + 25)}$

Step 1.5.5.3.7.2

Factor $x$ out of $25 x$ .

$y' = \frac{x (- 6 x^{2}) + x \cdot 25 - 6 x y^{2}}{y (6 x^{2} + 6 y^{2} + 25)}$

Step 1.5.5.3.7.3

Factor $x$ out of $- 6 x y^{2}$ .

$y' = \frac{x (- 6 x^{2}) + x \cdot 25 + x (- 6 y^{2})}{y (6 x^{2} + 6 y^{2} + 25)}$

Step 1.5.5.3.7.4

Factor $x$ out of $x (- 6 x^{2}) + x \cdot 25$ .

$y' = \frac{x (- 6 x^{2} + 25) + x (- 6 y^{2})}{y (6 x^{2} + 6 y^{2} + 25)}$

Step 1.5.5.3.7.5

Factor $x$ out of $x (- 6 x^{2} + 25) + x (- 6 y^{2})$ .

$y' = \frac{x (- 6 x^{2} + 25 - 6 y^{2})}{y (6 x^{2} + 6 y^{2} + 25)}$

Step 1.5.5.3.8

Factor $- 1$ out of $- 6 x^{2}$ .

$y' = \frac{x (- (6 x^{2}) + 25 - 6 y^{2})}{y (6 x^{2} + 6 y^{2} + 25)}$

Step 1.5.5.3.9

Rewrite $25$ as $- 1 (- 25)$ .

$y' = \frac{x (- (6 x^{2}) - 1 (- 25) - 6 y^{2})}{y (6 x^{2} + 6 y^{2} + 25)}$

Step 1.5.5.3.10

Factor $- 1$ out of $- (6 x^{2}) - 1 (- 25)$ .

$y' = \frac{x (- (6 x^{2} - 25) - 6 y^{2})}{y (6 x^{2} + 6 y^{2} + 25)}$

Step 1.5.5.3.11

Factor $- 1$ out of $- 6 y^{2}$ .

$y' = \frac{x (- (6 x^{2} - 25) - (6 y^{2}))}{y (6 x^{2} + 6 y^{2} + 25)}$

Step 1.5.5.3.12

Factor $- 1$ out of $- (6 x^{2} - 25) - (6 y^{2})$ .

$y' = \frac{x (- (6 x^{2} - 25 + 6 y^{2}))}{y (6 x^{2} + 6 y^{2} + 25)}$

Step 1.5.5.3.13

Simplify the expression.

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Step 1.5.5.3.13.1

Rewrite $- (6 x^{2} - 25 + 6 y^{2})$ as $- 1 (6 x^{2} - 25 + 6 y^{2})$ .

$y' = \frac{x (- 1 (6 x^{2} - 25 + 6 y^{2}))}{y (6 x^{2} + 6 y^{2} + 25)}$

Step 1.5.5.3.13.2

Move the negative in front of the fraction.

$y' = - \frac{x (6 x^{2} - 25 + 6 y^{2})}{y (6 x^{2} + 6 y^{2} + 25)}$

Step 1.6

Replace $y'$ with $\frac{d y}{d x}$ .

$\frac{d y}{d x} = - \frac{x (6 x^{2} - 25 + 6 y^{2})}{y (6 x^{2} + 6 y^{2} + 25)}$

Step 1.7

Evaluate at $x = 2$ and $y = 1$ .

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Step 1.7.1

Replace the variable $x$ with $2$ in the expression.

$- \frac{(2) (6 {(2)}^{2} - 25 + 6 y^{2})}{y (6 {(2)}^{2} + 6 y^{2} + 25)}$

Step 1.7.2

Replace the variable $y$ with $1$ in the expression.

$- \frac{(2) (6 {(2)}^{2} - 25 + 6 {(1)}^{2})}{(1) (6 {(2)}^{2} + 6 {(1)}^{2} + 25)}$

Step 1.7.3

Simplify the numerator.

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Step 1.7.3.1

Raise $2$ to the power of $2$ .

$- \frac{2 (6 \cdot 4 - 25 + 6 \cdot 1^{2})}{1 (6 \cdot 2^{2} + 6 \cdot 1^{2} + 25)}$

Step 1.7.3.2

Multiply $6$ by $4$ .

$- \frac{2 (24 - 25 + 6 \cdot 1^{2})}{1 (6 \cdot 2^{2} + 6 \cdot 1^{2} + 25)}$

Step 1.7.3.3

One to any power is one.

$- \frac{2 (24 - 25 + 6 \cdot 1)}{1 (6 \cdot 2^{2} + 6 \cdot 1^{2} + 25)}$

Step 1.7.3.4

Multiply $6$ by $1$ .

$- \frac{2 (24 - 25 + 6)}{1 (6 \cdot 2^{2} + 6 \cdot 1^{2} + 25)}$

Step 1.7.3.5

Subtract $25$ from $24$ .

$- \frac{2 (- 1 + 6)}{1 (6 \cdot 2^{2} + 6 \cdot 1^{2} + 25)}$

Step 1.7.3.6

Add $- 1$ and $6$ .

$- \frac{2 \cdot 5}{1 (6 \cdot 2^{2} + 6 \cdot 1^{2} + 25)}$

Step 1.7.4

Multiply.

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Step 1.7.4.1

Multiply $6 \cdot 2^{2} + 6 \cdot 1^{2} + 25$ by $1$ .

$- \frac{2 \cdot 5}{6 \cdot 2^{2} + 6 \cdot 1^{2} + 25}$

Step 1.7.4.2

Multiply $2$ by $5$ .

$- \frac{10}{6 \cdot 2^{2} + 6 \cdot 1^{2} + 25}$

Step 1.7.5

Simplify the denominator.

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Step 1.7.5.1

Raise $2$ to the power of $2$ .

$- \frac{10}{6 \cdot 4 + 6 \cdot 1^{2} + 25}$

Step 1.7.5.2

Multiply $6$ by $4$ .

$- \frac{10}{24 + 6 \cdot 1^{2} + 25}$

Step 1.7.5.3

One to any power is one.

$- \frac{10}{24 + 6 \cdot 1 + 25}$

Step 1.7.5.4

Multiply $6$ by $1$ .

$- \frac{10}{24 + 6 + 25}$

Step 1.7.5.5

Add $24$ and $6$ .

$- \frac{10}{30 + 25}$

Step 1.7.5.6

Add $30$ and $25$ .

$- \frac{10}{55}$

Step 1.7.6

Cancel the common factor of $10$ and $55$ .

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Step 1.7.6.1

Factor $5$ out of $10$ .

$- \frac{5 (2)}{55}$

Step 1.7.6.2

Cancel the common factors.

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Step 1.7.6.2.1

Factor $5$ out of $55$ .

$- \frac{5 \cdot 2}{5 \cdot 11}$

Step 1.7.6.2.2

Cancel the common factor.

$- \frac{5 \cdot 2}{5 \cdot 11}$

Step 1.7.6.2.3

Rewrite the expression.

$- \frac{2}{11}$

Step 2

Plug the slope and point values into the point-slope formula and solve for $y$ .

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Step 2.1

Use the slope $- \frac{2}{11}$ and a given point $(2, 1)$ to substitute for $x_{1}$ and $y_{1}$ in the point-slope form $y - y_{1} = m (x - x_{1})$ , which is derived from the slope equation $m = \frac{y_{2} - y_{1}}{x_{2} - x_{1}}$ .

$y - (1) = - \frac{2}{11} \cdot (x - (2))$

Step 2.2

Simplify the equation and keep it in point-slope form.

$y - 1 = - \frac{2}{11} \cdot (x - 2)$

Step 2.3

Solve for $y$ .

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Step 2.3.1

Simplify $- \frac{2}{11} \cdot (x - 2)$ .

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Step 2.3.1.1

Rewrite.

$y - 1 = 0 + 0 - \frac{2}{11} \cdot (x - 2)$

Step 2.3.1.2

Simplify by adding zeros.

$y - 1 = - \frac{2}{11} \cdot (x - 2)$

Step 2.3.1.3

Apply the distributive property.

$y - 1 = - \frac{2}{11} x - \frac{2}{11} \cdot - 2$

Step 2.3.1.4

Combine $x$ and $\frac{2}{11}$ .

$y - 1 = - \frac{x \cdot 2}{11} - \frac{2}{11} \cdot - 2$

Step 2.3.1.5

Multiply $- \frac{2}{11} \cdot - 2$ .

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Step 2.3.1.5.1

Multiply $- 2$ by $- 1$ .

$y - 1 = - \frac{x \cdot 2}{11} + 2 (\frac{2}{11})$

Step 2.3.1.5.2

Combine $2$ and $\frac{2}{11}$ .

$y - 1 = - \frac{x \cdot 2}{11} + \frac{2 \cdot 2}{11}$

Step 2.3.1.5.3

Multiply $2$ by $2$ .

$y - 1 = - \frac{x \cdot 2}{11} + \frac{4}{11}$

Step 2.3.1.6

Move $2$ to the left of $x$ .

$y - 1 = - \frac{2 x}{11} + \frac{4}{11}$

Step 2.3.2

Move all terms not containing $y$ to the right side of the equation.

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Step 2.3.2.1

Add $1$ to both sides of the equation.

$y = - \frac{2 x}{11} + \frac{4}{11} + 1$

Step 2.3.2.2

Write $1$ as a fraction with a common denominator.

$y = - \frac{2 x}{11} + \frac{4}{11} + \frac{11}{11}$

Step 2.3.2.3

Combine the numerators over the common denominator.

$y = - \frac{2 x}{11} + \frac{4 + 11}{11}$

Step 2.3.2.4

Add $4$ and $11$ .

$y = - \frac{2 x}{11} + \frac{15}{11}$

Step 2.3.3

Write in $y = m x + b$ form.

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Step 2.3.3.1

Reorder terms.

$y = - (\frac{2}{11} x) + \frac{15}{11}$

Step 2.3.3.2

Remove parentheses.

$y = - \frac{2}{11} x + \frac{15}{11}$

Step 3