\[9x-8y=36\]

Solving for y. Want to solve for x instead?
1
Subtract 9x9x from both sides.
8y=369x-8y=36-9x

2
Divide both sides by 8-8.
y=369x8y=-\frac{36-9x}{8}

3
Factor out the common term 99.
y=9(4x)8y=-\frac{9(4-x)}{8}

Done

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