Question

Find the value of y when x equals 4, -3x+9y=-57

Answer 1

-12 + 9y = -57

add 12 to both sides, 9y = -45

divide 9 from both sides to isolate the y

y = -5

Answer 2

-3(4)+9y=-57
-12+9y=-57
9y=-45
y=-5