The slope-intercept form is , where is the slope and is the y-intercept.

Using the slope-intercept form, the slope is .

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

Move the negative in front of the fraction.

Multiply .

Multiply by .

Multiply by .

Find the Slope of a Perpendicular Line y=-9x+7