Question

What is the equation of a line that passes through the point (0, -3) and is perpendicular to a line with a slope of 4

Answer 1

for perpendicular lines the product of the slopes is -1
let the slopes = m1 and m2 then m1*m2 =-1
so you have a slope of 4 what is the the slope of the perpendicular line?

Answer 2

next you have the slope of the line, m and 2 points on the line (x, y) and (0, -3)
the equation of the line is (y-y1) = m(x- x1) where (x,y) is any point on the line and (x1, y1) is a known point on the line

Answer 3

any questions?