Question

through:(-5, -4), perp. to y = 5x – 5

Answer 1

Perpendicular means reverse reciprocal of the slope. Here the slope is 5 so the slope of the perp line is -1/5. Now you have y = -1/5 + x so just plug in -5 as x and -4 as y and you get -4 = -1/5 - 5