Question

Solve 9x - y = 45 for y

Answer 1

9x - y = 45

To make y the subject of the formular we have to make y stand alone.

9x - y = 45

substract 9x from both sides

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

- y = 45 - 9x

multiply both sides by - 1

y = - (45 - 9x)

y = - 45 + 9x

y = 9x - 45