Algebra Examples

(3, - 2)

$(3, - 2)$ that is perpendicular to the line

3 x + 4 y = 5

$3 x + 4 y = 5$

Step 1

Solve

3 x + 4 y = 5

$3 x + 4 y = 5$ .

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Step 1.1

Subtract

3 x

$3 x$ from both sides of the equation.

4 y = 5 - 3 x

$4 y = 5 - 3 x$

Step 1.2

Divide each term in

4 y = 5 - 3 x

$4 y = 5 - 3 x$ by

4

$4$ and simplify.

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Step 1.2.1

Divide each term in

4 y = 5 - 3 x

$4 y = 5 - 3 x$ by

4

$4$ .

\frac{4 y}{4} = \frac{5}{4} + \frac{- 3 x}{4}

$\frac{4 y}{4} = \frac{5}{4} + \frac{- 3 x}{4}$

Step 1.2.2

Simplify the left side.

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Step 1.2.2.1

Cancel the common factor of

4

$4$ .

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Step 1.2.2.1.1

Cancel the common factor.

$\frac{4 y}{4} = \frac{5}{4} + \frac{- 3 x}{4}$

Step 1.2.2.1.2

Divide

$y$ by

$1$ .

$y = \frac{5}{4} + \frac{- 3 x}{4}$

Step 1.2.3

Simplify the right side.

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Step 1.2.3.1

Move the negative in front of the fraction.

$y = \frac{5}{4} - \frac{3 x}{4}$

Step 2

Find the slope when

$y = \frac{5}{4} - \frac{3 x}{4}$ .

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Step 2.1

Rewrite in slope-intercept form.

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Step 2.1.1

The slope-intercept form is

$y = m x + b$ , where

$m$ is the slope and

$b$ is the y-intercept.

$y = m x + b$

Step 2.1.2

Reorder

$\frac{5}{4}$ and

$- \frac{3 x}{4}$ .

$y = - \frac{3 x}{4} + \frac{5}{4}$

Step 2.1.3

Write in

$y = m x + b$ form.

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Step 2.1.3.1

Reorder terms.

$y = - (\frac{3}{4} x) + \frac{5}{4}$

Step 2.1.3.2

Remove parentheses.

$y = - \frac{3}{4} x + \frac{5}{4}$

Step 2.2

Using the slope-intercept form, the slope is

$- \frac{3}{4}$ .

$m = - \frac{3}{4}$

Step 3

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

$m_{perpendicular} = - \frac{1}{- \frac{3}{4}}$

Step 4

Simplify

$- \frac{1}{- \frac{3}{4}}$ to find the slope of the perpendicular line.

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Step 4.1

Cancel the common factor of

$1$ and

$- 1$ .

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Step 4.1.1

Rewrite

$1$ as

$- 1 (- 1)$ .

$m_{perpendicular} = - \frac{- 1 \cdot - 1}{- \frac{3}{4}}$

Step 4.1.2

Move the negative in front of the fraction.

$m_{perpendicular} = \frac{1}{\frac{3}{4}}$

Step 4.2

Multiply the numerator by the reciprocal of the denominator.

$m_{perpendicular} = 1 (\frac{4}{3})$

Step 4.3

Multiply

$\frac{4}{3}$ by

$1$ .

$m_{perpendicular} = \frac{4}{3}$

Step 4.4

Multiply

$- - \frac{4}{3}$ .

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Step 4.4.1

Multiply

$- 1$ by

$- 1$ .

$m_{perpendicular} = 1 (\frac{4}{3})$

Step 4.4.2

Multiply

$\frac{4}{3}$ by

$1$ .

$m_{perpendicular} = \frac{4}{3}$

Step 5

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

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Step 5.1

Use the slope

$\frac{4}{3}$ and a given point

$(3, - 2)$ 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

$m = \frac{y_{2} - y_{1}}{x_{2} - x_{1}}$ .

$y - (- 2) = \frac{4}{3} \cdot (x - (3))$

Step 5.2

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

$y + 2 = \frac{4}{3} \cdot (x - 3)$

Step 6

Write in

$y = m x + b$ form.

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Step 6.1

Solve for

$y$ .

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Step 6.1.1

Simplify

$\frac{4}{3} \cdot (x - 3)$ .

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Step 6.1.1.1

Rewrite.

$y + 2 = 0 + 0 + \frac{4}{3} \cdot (x - 3)$

Step 6.1.1.2

Simplify by adding zeros.

$y + 2 = \frac{4}{3} \cdot (x - 3)$

Step 6.1.1.3

Apply the distributive property.

$y + 2 = \frac{4}{3} x + \frac{4}{3} \cdot - 3$

Step 6.1.1.4

Combine

$\frac{4}{3}$ and

$x$ .

$y + 2 = \frac{4 x}{3} + \frac{4}{3} \cdot - 3$

Step 6.1.1.5

Cancel the common factor of

$3$ .

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Step 6.1.1.5.1

Factor

$3$ out of

$- 3$ .

$y + 2 = \frac{4 x}{3} + \frac{4}{3} \cdot (3 (- 1))$

Step 6.1.1.5.2

Cancel the common factor.

$y + 2 = \frac{4 x}{3} + \frac{4}{3} \cdot (3 \cdot - 1)$

Step 6.1.1.5.3

Rewrite the expression.

$y + 2 = \frac{4 x}{3} + 4 \cdot - 1$

Step 6.1.1.6

Multiply

$4$ by

$- 1$ .

$y + 2 = \frac{4 x}{3} - 4$

Step 6.1.2

Move all terms not containing

$y$ to the right side of the equation.

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Step 6.1.2.1

Subtract

$2$ from both sides of the equation.

$y = \frac{4 x}{3} - 4 - 2$

Step 6.1.2.2

Subtract

$2$ from

$- 4$ .

$y = \frac{4 x}{3} - 6$

Step 6.2

Reorder terms.

$y = \frac{4}{3} x - 6$

Step 7