Precalculus Examples

$y = 4 x$

Choose a point that the parallel line will pass through.

$(1, 0)$

Use the slope-intercept form to find the slope.

Tap for more steps...

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

$y = m x + b$

Using the slope-intercept form, the slope is $4$ .

$m = 4$

To find an equation that is parallel, the slopes must be equal. Find the parallel line using the point-slope formula.

Use the slope $4$ and a given point $(1, 0)$ 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 $m = \frac{y_{2} - y_{1}}{x_{2} - x_{1}}$ .

$y - (0) = (4) (x - (1))$

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

$y + 0 = 4 \cdot (x - 1)$

Solve for $y$ .

Tap for more steps...

Add $y$ and $0$ .

$y = 4 \cdot (x - 1)$

Simplify $4 \cdot (x - 1)$ .

Tap for more steps...

Apply the distributive property.

$y = 4 x + 4 \cdot - 1$

Multiply $4$ by $- 1$ .

$y = 4 x - 4$

Enter YOUR Problem