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

The spoke of a wheel reaches from the center of the wheel to its rim. If the circumference of the wheel is 42 inches, how long is each spoke? Round your answer to the nearest 100th a certain rectangle has lengths that are twice its width. the perimeter of this rectangle is 72 centimeters. this rectangle actually represents a drawing of the size of a planned v