Linear Algebra Examples

$f = 1 - 0.2625 + \frac{x}{4500} + 0.75 (\frac{y}{4500}) + (\frac{y (t - x - y)}{4500 \cdot 1800})$ , $1 - (0.35 - \frac{x}{3375}) - \frac{y}{4500} = 0$

Step 1

Remove parentheses.

$f = 1 - 0.2625 + \frac{x}{4500} + 0.75 (\frac{y}{4500}) + \frac{y (t - x - y)}{4500 \cdot 1800}, 1 - (0.35 - \frac{x}{3375}) - \frac{y}{4500} = 0$

Step 2

Simplify.

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Step 2.1

Simplify each term.

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Step 2.1.1

Cancel the common factor of $0.75$ .

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Step 2.1.1.1

Factor $0.75$ out of $4500$ .

$f = 1 - 0.2625 + \frac{x}{4500} + 0.75 \frac{y}{0.75 (6000)} + \frac{y (t - x - y)}{4500 \cdot 1800}, 1 - (0.35 - \frac{x}{3375}) - \frac{y}{4500} = 0$

Step 2.1.1.2

Cancel the common factor.

$f = 1 - 0.2625 + \frac{x}{4500} + 0.75 \frac{y}{0.75 \cdot 6000} + \frac{y (t - x - y)}{4500 \cdot 1800}, 1 - (0.35 - \frac{x}{3375}) - \frac{y}{4500} = 0$

Step 2.1.1.3

Rewrite the expression.

$f = 1 - 0.2625 + \frac{x}{4500} + \frac{y}{6000} + \frac{y (t - x - y)}{4500 \cdot 1800}, 1 - (0.35 - \frac{x}{3375}) - \frac{y}{4500} = 0$

Step 2.1.2

Multiply $4500$ by $1800$ .

$f = 1 - 0.2625 + \frac{x}{4500} + \frac{y}{6000} + \frac{y (t - x - y)}{8100000}, 1 - (0.35 - \frac{x}{3375}) - \frac{y}{4500} = 0$

Step 2.2

Subtract $0.2625$ from $1$ .

$f = 0.7375 + \frac{x}{4500} + \frac{y}{6000} + \frac{y (t - x - y)}{8100000}, 1 - (0.35 - \frac{x}{3375}) - \frac{y}{4500} = 0$

Step 2.3

To write $0.7375$ as a fraction with a common denominator, multiply by $\frac{8100000}{8100000}$ .

$f = \frac{x}{4500} + \frac{y}{6000} + 0.7375 \cdot \frac{8100000}{8100000} + \frac{y (t - x - y)}{8100000}, 1 - (0.35 - \frac{x}{3375}) - \frac{y}{4500} = 0$

Step 2.4

Combine $0.7375$ and $\frac{8100000}{8100000}$ .

$f = \frac{x}{4500} + \frac{y}{6000} + \frac{0.7375 \cdot 8100000}{8100000} + \frac{y (t - x - y)}{8100000}, 1 - (0.35 - \frac{x}{3375}) - \frac{y}{4500} = 0$

Step 2.5

Combine the numerators over the common denominator.

$f = \frac{x}{4500} + \frac{y}{6000} + \frac{0.7375 \cdot 8100000 + y (t - x - y)}{8100000}, 1 - (0.35 - \frac{x}{3375}) - \frac{y}{4500} = 0$

Step 2.6

Multiply $0.7375$ by $8100000$ .

$f = \frac{x}{4500} + \frac{y}{6000} + \frac{5973750 + y (t - x - y)}{8100000}, 1 - (0.35 - \frac{x}{3375}) - \frac{y}{4500} = 0$

Step 2.7

Simplify the numerator.

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Step 2.7.1

Apply the distributive property.

$f = \frac{x}{4500} + \frac{y}{6000} + \frac{5973750 + y t + y (- x) + y (- y)}{8100000}, 1 - (0.35 - \frac{x}{3375}) - \frac{y}{4500} = 0$

Step 2.7.2

Simplify.

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Step 2.7.2.1

Rewrite using the commutative property of multiplication.

$f = \frac{x}{4500} + \frac{y}{6000} + \frac{5973750 + y t - y x + y (- y)}{8100000}, 1 - (0.35 - \frac{x}{3375}) - \frac{y}{4500} = 0$

Step 2.7.2.2

Rewrite using the commutative property of multiplication.

$f = \frac{x}{4500} + \frac{y}{6000} + \frac{5973750 + y t - y x - y \cdot y}{8100000}, 1 - (0.35 - \frac{x}{3375}) - \frac{y}{4500} = 0$

Step 2.7.3

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

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Step 2.7.3.1

Move $y$ .

$f = \frac{x}{4500} + \frac{y}{6000} + \frac{5973750 + y t - y x - (y \cdot y)}{8100000}, 1 - (0.35 - \frac{x}{3375}) - \frac{y}{4500} = 0$

Step 2.7.3.2

Multiply $y$ by $y$ .

$f = \frac{x}{4500} + \frac{y}{6000} + \frac{5973750 + y t - y x - y^{2}}{8100000}, 1 - (0.35 - \frac{x}{3375}) - \frac{y}{4500} = 0$

Step 2.8

To write $\frac{x}{4500}$ as a fraction with a common denominator, multiply by $\frac{1800}{1800}$ .

$f = \frac{y}{6000} + \frac{x}{4500} \cdot \frac{1800}{1800} + \frac{5973750 + y t - y x - y^{2}}{8100000}, 1 - (0.35 - \frac{x}{3375}) - \frac{y}{4500} = 0$

Step 2.9

Write each expression with a common denominator of $8100000$ , by multiplying each by an appropriate factor of $1$ .

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Step 2.9.1

Multiply $\frac{x}{4500}$ by $\frac{1800}{1800}$ .

$f = \frac{y}{6000} + \frac{x \cdot 1800}{4500 \cdot 1800} + \frac{5973750 + y t - y x - y^{2}}{8100000}, 1 - (0.35 - \frac{x}{3375}) - \frac{y}{4500} = 0$

Step 2.9.2

Multiply $4500$ by $1800$ .

$f = \frac{y}{6000} + \frac{x \cdot 1800}{8100000} + \frac{5973750 + y t - y x - y^{2}}{8100000}, 1 - (0.35 - \frac{x}{3375}) - \frac{y}{4500} = 0$

Step 2.10

Combine the numerators over the common denominator.

$f = \frac{y}{6000} + \frac{x \cdot 1800 + 5973750 + y t - y x - y^{2}}{8100000}, 1 - (0.35 - \frac{x}{3375}) - \frac{y}{4500} = 0$

Step 2.11

Move $1800$ to the left of $x$ .

$f = \frac{y}{6000} + \frac{1800 x + 5973750 + y t - y x - y^{2}}{8100000}, 1 - (0.35 - \frac{x}{3375}) - \frac{y}{4500} = 0$

Step 2.12

To write $\frac{y}{6000}$ as a fraction with a common denominator, multiply by $\frac{1350}{1350}$ .

$f = \frac{y}{6000} \cdot \frac{1350}{1350} + \frac{1800 x + 5973750 + y t - y x - y^{2}}{8100000}, 1 - (0.35 - \frac{x}{3375}) - \frac{y}{4500} = 0$

Step 2.13

Write each expression with a common denominator of $8100000$ , by multiplying each by an appropriate factor of $1$ .

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Step 2.13.1

Multiply $\frac{y}{6000}$ by $\frac{1350}{1350}$ .

$f = \frac{y \cdot 1350}{6000 \cdot 1350} + \frac{1800 x + 5973750 + y t - y x - y^{2}}{8100000}, 1 - (0.35 - \frac{x}{3375}) - \frac{y}{4500} = 0$

Step 2.13.2

Multiply $6000$ by $1350$ .

$f = \frac{y \cdot 1350}{8100000} + \frac{1800 x + 5973750 + y t - y x - y^{2}}{8100000}, 1 - (0.35 - \frac{x}{3375}) - \frac{y}{4500} = 0$

Step 2.14

Combine the numerators over the common denominator.

$f = \frac{y \cdot 1350 + 1800 x + 5973750 + y t - y x - y^{2}}{8100000}, 1 - (0.35 - \frac{x}{3375}) - \frac{y}{4500} = 0$

Step 2.15

Move $1350$ to the left of $y$ .

$f = \frac{1350 y + 1800 x + 5973750 + y t - y x - y^{2}}{8100000}, 1 - (0.35 - \frac{x}{3375}) - \frac{y}{4500} = 0$

Step 3

Move all terms containing variables to the left side of the equation.

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Step 3.1

Subtract $\frac{1350 y + 1800 x + 5973750 + y t - y x - y^{2}}{8100000}$ from both sides of the equation.

$f - \frac{1350 y + 1800 x + 5973750 + y t - y x - y^{2}}{8100000} = 0, 1 - (0.35 - \frac{x}{3375}) - \frac{y}{4500} = 0$

Step 3.2

To write $f$ as a fraction with a common denominator, multiply by $\frac{8100000}{8100000}$ .

$f \cdot \frac{8100000}{8100000} - \frac{1350 y + 1800 x + 5973750 + y t - y x - y^{2}}{8100000} = 0, 1 - (0.35 - \frac{x}{3375}) - \frac{y}{4500} = 0$

Step 3.3

Combine $f$ and $\frac{8100000}{8100000}$ .

$\frac{f \cdot 8100000}{8100000} - \frac{1350 y + 1800 x + 5973750 + y t - y x - y^{2}}{8100000} = 0, 1 - (0.35 - \frac{x}{3375}) - \frac{y}{4500} = 0$

Step 3.4

Combine the numerators over the common denominator.

$\frac{f \cdot 8100000 - (1350 y + 1800 x + 5973750 + y t - y x - y^{2})}{8100000} = 0, 1 - (0.35 - \frac{x}{3375}) - \frac{y}{4500} = 0$

Step 3.5

Simplify the numerator.

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Step 3.5.1

Move $8100000$ to the left of $f$ .

$\frac{8100000 \cdot f - (1350 y + 1800 x + 5973750 + y t - y x - y^{2})}{8100000} = 0, 1 - (0.35 - \frac{x}{3375}) - \frac{y}{4500} = 0$

Step 3.5.2

Apply the distributive property.

$\frac{8100000 f - (1350 y) - (1800 x) - 1 \cdot 5973750 - (y t) - (- y x) - - y^{2}}{8100000} = 0, 1 - (0.35 - \frac{x}{3375}) - \frac{y}{4500} = 0$

Step 3.5.3

Simplify.

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Step 3.5.3.1

Multiply $1350$ by $- 1$ .

$\frac{8100000 f - 1350 y - (1800 x) - 1 \cdot 5973750 - (y t) - (- y x) - - y^{2}}{8100000} = 0, 1 - (0.35 - \frac{x}{3375}) - \frac{y}{4500} = 0$

Step 3.5.3.2

Multiply $1800$ by $- 1$ .

$\frac{8100000 f - 1350 y - 1800 x - 1 \cdot 5973750 - (y t) - (- y x) - - y^{2}}{8100000} = 0, 1 - (0.35 - \frac{x}{3375}) - \frac{y}{4500} = 0$

Step 3.5.3.3

Multiply $- 1$ by $5973750$ .

$\frac{8100000 f - 1350 y - 1800 x - 5973750 - (y t) - (- y x) - - y^{2}}{8100000} = 0, 1 - (0.35 - \frac{x}{3375}) - \frac{y}{4500} = 0$

Step 3.5.3.4

Multiply $- (- y x)$ .

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Step 3.5.3.4.1

Multiply $- 1$ by $- 1$ .

$\frac{8100000 f - 1350 y - 1800 x - 5973750 - y t + 1 (y x) - - y^{2}}{8100000} = 0, 1 - (0.35 - \frac{x}{3375}) - \frac{y}{4500} = 0$

Step 3.5.3.4.2

Multiply $y$ by $1$ .

$\frac{8100000 f - 1350 y - 1800 x - 5973750 - y t + y x - - y^{2}}{8100000} = 0, 1 - (0.35 - \frac{x}{3375}) - \frac{y}{4500} = 0$

Step 3.5.3.5

Multiply $- - y^{2}$ .

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Step 3.5.3.5.1

Multiply $- 1$ by $- 1$ .

$\frac{8100000 f - 1350 y - 1800 x - 5973750 - y t + y x + 1 y^{2}}{8100000} = 0, 1 - (0.35 - \frac{x}{3375}) - \frac{y}{4500} = 0$

Step 3.5.3.5.2

Multiply $y^{2}$ by $1$ .

$\frac{8100000 f - 1350 y - 1800 x - 5973750 - y t + y x + y^{2}}{8100000} = 0, 1 - (0.35 - \frac{x}{3375}) - \frac{y}{4500} = 0$

Step 4

Simplify.

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Step 4.1

Simplify each term.

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Step 4.1.1

Apply the distributive property.

$\frac{8100000 f - 1350 y - 1800 x - 5973750 - y t + y x + y^{2}}{8100000} = 0, 1 - 1 \cdot 0.35 - - \frac{x}{3375} - \frac{y}{4500} = 0$

Step 4.1.2

Multiply $- 1$ by $0.35$ .

$\frac{8100000 f - 1350 y - 1800 x - 5973750 - y t + y x + y^{2}}{8100000} = 0, 1 - 0.35 - - \frac{x}{3375} - \frac{y}{4500} = 0$

Step 4.1.3

Multiply $- - \frac{x}{3375}$ .

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Step 4.1.3.1

Multiply $- 1$ by $- 1$ .

$\frac{8100000 f - 1350 y - 1800 x - 5973750 - y t + y x + y^{2}}{8100000} = 0, 1 - 0.35 + 1 \frac{x}{3375} - \frac{y}{4500} = 0$

Step 4.1.3.2

Multiply $\frac{x}{3375}$ by $1$ .

$\frac{8100000 f - 1350 y - 1800 x - 5973750 - y t + y x + y^{2}}{8100000} = 0, 1 - 0.35 + \frac{x}{3375} - \frac{y}{4500} = 0$

Step 4.2

Subtract $0.35$ from $1$ .

$\frac{8100000 f - 1350 y - 1800 x - 5973750 - y t + y x + y^{2}}{8100000} = 0, 0.65 + \frac{x}{3375} - \frac{y}{4500} = 0$

Step 5

Subtract $0.65$ from both sides of the equation.

$\frac{8100000 f - 1350 y - 1800 x - 5973750 - y t + y x + y^{2}}{8100000} = 0, \frac{x}{3375} - \frac{y}{4500} = - 0.65$

Step 6

Write the system of equations in matrix form.

$[\begin{array}{c} \frac{1}{8100000} & 0 & 0 & 0 & 0 \\ 0 & 0 & \frac{1}{3375} & - \frac{1}{4500} & - 0.65 \end{array}]$

Step 7

Find the reduced row echelon form.

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Step 7.1

Multiply each element of $R_{1}$ by $\frac{1}{1.2345679 \cdot 10^{- 7}}$ to make the entry at $1, 1$ a $1$ .

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Step 7.1.1

Multiply each element of $R_{1}$ by $\frac{1}{1.2345679 \cdot 10^{- 7}}$ to make the entry at $1, 1$ a $1$ .

$[\begin{array}{c} \frac{\frac{1}{8100000}}{1.2345679 \cdot 10^{- 7}} & \frac{0}{1.2345679 \cdot 10^{- 7}} & \frac{0}{1.2345679 \cdot 10^{- 7}} & \frac{0}{1.2345679 \cdot 10^{- 7}} & \frac{0}{1.2345679 \cdot 10^{- 7}} \\ 0 & 0 & \frac{1}{3375} & - \frac{1}{4500} & - 0.65 \end{array}]$

Step 7.1.2

Simplify $R_{1}$ .

$[\begin{array}{c} 1 & 0 & 0 & 0 & 0 \\ 0 & 0 & \frac{1}{3375} & - \frac{1}{4500} & - 0.65 \end{array}]$

Step 7.2

Multiply each element of $R_{2}$ by $3375$ to make the entry at $2, 3$ a $1$ .

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Step 7.2.1

Multiply each element of $R_{2}$ by $3375$ to make the entry at $2, 3$ a $1$ .

$[\begin{array}{c} 1 & 0 & 0 & 0 & 0 \\ 3375 \cdot 0 & 3375 \cdot 0 & 3375 (\frac{1}{3375}) & 3375 (- \frac{1}{4500}) & 3375 \cdot - 0.65 \end{array}]$

Step 7.2.2

Simplify $R_{2}$ .

$[\begin{array}{c} 1 & 0 & 0 & 0 & 0 \\ 0 & 0 & 1 & - \frac{3}{4} & - 2193.75 \end{array}]$

Step 8

Use the result matrix to declare the final solutions to the system of equations.

$1 f = 0$

$x - \frac{3 y}{4} = - 2193.75$

Step 9

Divide each term in $1 f = 0$ by $1$ and simplify.

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Step 9.1

Divide each term in $1 f = 0$ by $1$ .

$\frac{1 f}{1} = \frac{0}{1}$

$x - \frac{3 y}{4} = - 2193.75$

Step 9.2

Simplify the left side.

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Step 9.2.1

Cancel the common factor of $1$ .

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Step 9.2.1.1

Cancel the common factor.

$\frac{1 f}{1} = \frac{0}{1}$

$x - \frac{3 y}{4} = - 2193.75$

Step 9.2.1.2

Divide $f$ by $1$ .

$f = \frac{0}{1}$

$x - \frac{3 y}{4} = - 2193.75$

$f = \frac{0}{1}$

$x - \frac{3 y}{4} = - 2193.75$

$f = \frac{0}{1}$

$x - \frac{3 y}{4} = - 2193.75$

Step 9.3

Simplify the right side.

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Step 9.3.1

Divide $0$ by $1$ .

$f = 0$

$x - \frac{3 y}{4} = - 2193.75$

$f = 0$

$x - \frac{3 y}{4} = - 2193.75$

$f = 0$

$x - \frac{3 y}{4} = - 2193.75$

Step 10

Add $\frac{3 y}{4}$ to both sides of the equation.

$x = - 2193.75 + \frac{3 y}{4}$

$f = 0$

Step 11

The solution is the set of ordered pairs that makes the system true.

$(0, t, - 2193.75 + \frac{3 y}{4}, y)$

Step 12

Decompose a solution vector by re-arranging each equation represented in the row-reduced form of the augmented matrix by solving for the dependent variable in each row yields the vector equality.

$X = [\begin{array}{c} f \\ t \\ x \\ y \end{array}] = [\begin{array}{c} 0 \\ t \\ - 2193.75 + \frac{3 y}{4} \\ y \end{array}]$