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

Combine and .

Rewrite in slope-intercept form.

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.

Multiply the numerator by the reciprocal of the denominator.

Multiply by .

Find the Slope of a Perpendicular Line y=4/7x+9