Find the Perpendicular Line Passing through (8,-7) and perpendicular to the line whose equation is y=1/3x+5

Passing through $(8, - 7)$ and perpendicular to the line whose equation is $y = \frac{1}{3} x + 5$

Step 1

Find the slope when $y = \frac{1}{3} x + 5$ .

Rewrite in slope-intercept form.

The slope-intercept form is $y = m x + b$ , where $m$ is the slope and $b$ is the y-intercept.

$y = m x + b$

Simplify the right side.

Combine $\frac{1}{3}$ and $x$ .

$y = \frac{x}{3} + 5$

Reorder terms.

$y = \frac{1}{3} x + 5$

Using the slope-intercept form, the slope is $\frac{1}{3}$ .

$m = \frac{1}{3}$

Step 2

The equation of a perpendicular line must have a slope that is the negative reciprocal of the original slope.

$m_{perpendicular} = - \frac{1}{\frac{1}{3}}$

Step 3

Simplify $- \frac{1}{\frac{1}{3}}$ to find the slope of the perpendicular line.

Multiply the numerator by the reciprocal of the denominator.

$m_{perpendicular} = - (1 \cdot 3)$

Multiply $- (1 \cdot 3)$ .

Multiply $3$ by $1$ .

$m_{perpendicular} = - 1 \cdot 3$

Multiply $- 1$ by $3$ .

$m_{perpendicular} = - 3$

Step 4

Find the equation of the perpendicular line using the point-slope formula.

Use the slope $- 3$ and a given point $(8, - 7)$ 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 $m = \frac{y_{2} - y_{1}}{x_{2} - x_{1}}$ .

$y - (- 7) = - 3 \cdot (x - (8))$

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

$y + 7 = - 3 \cdot (x - 8)$

Step 5

Solve for $y$ .

Simplify $- 3 \cdot (x - 8)$ .

Rewrite.

$y + 7 = 0 + 0 - 3 \cdot (x - 8)$

Simplify by adding zeros.

$y + 7 = - 3 \cdot (x - 8)$

Apply the distributive property.

$y + 7 = - 3 x - 3 \cdot - 8$

Multiply $- 3$ by $- 8$ .

$y + 7 = - 3 x + 24$

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

Subtract $7$ from both sides of the equation.

$y = - 3 x + 24 - 7$

Subtract $7$ from $24$ .

$y = - 3 x + 17$

Step 6

Find the Perpendicular Line Passing through (8,-7) and perpendicular to the line whose equation is y=1/3x+5

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