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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