Solve 9x-y = 45 for y

y = 9x - 45

Step-by-step explanation:

9x - y = 45 subtract 9x from both sides

9x - 9x - y = - 9x + 45

-y = - 9x + 45 change the signs

y = 9x - 45

9x-y = 45

Move 9x to the other side. Sign changes from + 9x to - 9x.

9x-9x-y=45-9x

-y=45-9x

Multiply both sides by - 1

(-1) (-y) = y

(-1) (45) = -45

(-1) (-9x)

y=-45+9x or y=9x-45

Answer: y=-45+9x or y=9x-45