Find the value of y if the line through the two given points is to have the indicated slope. (-5,y) and (-9,8), m=-3

Question

Finding y.

Answer 1

y=mx+b

y=-3x+b

using (-9,8)

8=(-3)(-9)+b

8=27+b

8-27=b

b=-19

y=-3x-19

using (-5,y)

y=(-3)(-5)-19

y=15-19

y=-4 (answer)