exam Maths Puzzle Numerical Ability

Solve by the elimination method.

9x-9y=36

7y-3x= -14
What is the solution of the system?
Can someone explain this to me? I do not understand this at all...not of it.

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exam Other Question

find the value for k so that 9m^2-kn^2 will have the factors 3m+7n and 3m-7n The length of a rectangle is 3 in. more than twice its width. If the perimeter of the rectangle is 36 in., whatt wioud be the width of the rectangle.