book Maths Puzzle Numerical Ability

I need help,here's an example:

Rewrite the equation so that y is a function of x.

-4x + y = 9
-3y + 18x = 12

Please keep it simple I'm only 12. Thanks, Tony

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book Other Question

factor:2x^2+6x through (8,-3)
perpendicular to -5x-3y=-31