Precalculus Examples

$y = 49 - 7 x$

Step 1

Find the x-intercepts.

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Step 1.1

To find the x-intercept(s), substitute in $0$ for $y$ and solve for $x$ .

$0 = 49 - 7 x$

Step 1.2

Solve the equation.

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Step 1.2.1

Rewrite the equation as $49 - 7 x = 0$ .

$49 - 7 x = 0$

Step 1.2.2

Subtract $49$ from both sides of the equation.

$- 7 x = - 49$

Step 1.2.3

Divide each term in $- 7 x = - 49$ by $- 7$ and simplify.

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Step 1.2.3.1

Divide each term in $- 7 x = - 49$ by $- 7$ .

$\frac{- 7 x}{- 7} = \frac{- 49}{- 7}$

Step 1.2.3.2

Simplify the left side.

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Step 1.2.3.2.1

Cancel the common factor of $- 7$ .

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Step 1.2.3.2.1.1

Cancel the common factor.

$\frac{- 7 x}{- 7} = \frac{- 49}{- 7}$

Step 1.2.3.2.1.2

Divide $x$ by $1$ .

$x = \frac{- 49}{- 7}$

Step 1.2.3.3

Simplify the right side.

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Step 1.2.3.3.1

Divide $- 49$ by $- 7$ .

$x = 7$

Step 1.3

x-intercept(s) in point form.

x-intercept(s): $(7, 0)$

Step 2

Find the y-intercepts.

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Step 2.1

To find the y-intercept(s), substitute in $0$ for $x$ and solve for $y$ .

$y = 49 - 7 \cdot 0$

Step 2.2

Solve the equation.

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Step 2.2.1

Remove parentheses.

$y = 49 - 7 \cdot 0$

Step 2.2.2

Simplify $49 - 7 \cdot 0$ .

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Step 2.2.2.1

Multiply $- 7$ by $0$ .

$y = 49 + 0$

Step 2.2.2.2

Add $49$ and $0$ .

$y = 49$

Step 2.3

y-intercept(s) in point form.

y-intercept(s): $(0, 49)$

Step 3

List the intersections.

x-intercept(s): $(7, 0)$

y-intercept(s): $(0, 49)$

Step 4