Question

Solve 9x-y = 45 for y

Answer 1

y = 9x - 45

Explanation:

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

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

-y = -9x + 45 change the signs

y = 9x - 45

Answer 2

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