Find the Perpendicular Line through: (-5,5) , perp. to y=5/9x-4

through: $(- 5, 5)$ , perp. to $y = \frac{5}{9} x - 4$

Step 1

Find the slope when $y = \frac{5}{9} x - 4$ .

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 $\frac{5}{9}$ and $x$ .

$y = \frac{5 x}{9} - 4$

Reorder terms.

$y = \frac{5}{9} x - 4$

Using the slope-intercept form, the slope is $\frac{5}{9}$ .

$m = \frac{5}{9}$

Step 2

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

$m_{perpendicular} = - \frac{1}{\frac{5}{9}}$

Step 3

Simplify $- \frac{1}{\frac{5}{9}}$ to find the slope of the perpendicular line.

Multiply the numerator by the reciprocal of the denominator.

$m_{perpendicular} = - (1 (\frac{9}{5}))$

Multiply $\frac{9}{5}$ by $1$ .

$m_{perpendicular} = - \frac{9}{5}$

Step 4

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

Use the slope $- \frac{9}{5}$ and a given point $(- 5, 5)$ 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 $m = \frac{y_{2} - y_{1}}{x_{2} - x_{1}}$ .

$y - (5) = - \frac{9}{5} \cdot (x - (- 5))$

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

$y - 5 = - \frac{9}{5} \cdot (x + 5)$

Step 5

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

Solve for $y$ .

Simplify $- \frac{9}{5} \cdot (x + 5)$ .

Rewrite.

$y - 5 = 0 + 0 - \frac{9}{5} \cdot (x + 5)$

Simplify terms.

Apply the distributive property.

$y - 5 = - \frac{9}{5} x - \frac{9}{5} \cdot 5$

Combine $x$ and $\frac{9}{5}$ .

$y - 5 = - \frac{x \cdot 9}{5} - \frac{9}{5} \cdot 5$

Cancel the common factor of $5$ .

Move the leading negative in $- \frac{9}{5}$ into the numerator.

$y - 5 = - \frac{x \cdot 9}{5} + \frac{- 9}{5} \cdot 5$

Cancel the common factor.

$y - 5 = - \frac{x \cdot 9}{5} + \frac{- 9}{5} \cdot 5$

Rewrite the expression.

$y - 5 = - \frac{x \cdot 9}{5} - 9$

Move $9$ to the left of $x$ .

$y - 5 = - \frac{9 x}{5} - 9$

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

Add $5$ to both sides of the equation.

$y = - \frac{9 x}{5} - 9 + 5$

Add $- 9$ and $5$ .

$y = - \frac{9 x}{5} - 4$

Reorder terms.

$y = - (\frac{9}{5} x) - 4$

Remove parentheses.

$y = - \frac{9}{5} x - 4$

Step 6

Find the Perpendicular Line through: (-5,5) , perp. to y=5/9x-4

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