book Maths Puzzle Numerical Ability

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

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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 What is the equation of a circle with center (0,1) and a radius 2 units?

Thanks