Question

y-15=3(x-12) in slope intercept form

Answer 1

solve for y

y-15=3(x-12)

y-15=3x-36

y = 3x-36+15

y = 3x - 21

Answer 2

Basically the goal is to convert the given equation into y = mx+b form, which is close to the same thing as saying "solve for y" (but you have to do a bit of simplification first)