(4,y) (0,5); m=3/4

Answer 1

the underlying value that you want to use here is

m = (y2 - y1) / (x2 - x1)

for this equation that becomes

3/4 = (5 - y) / (0 - 4)

3/4 = (5 - y) / -4

3/4(-4) = 5 - y

-3 = 5 - y

y = 8

Answer 2

(y-5)/(4-0) = (y-5)/4 = 3/4

y-5 = 3

y= 8