book Maths Puzzle Numerical Ability

Find the dimensions of a rectangle whose area is 180 sq. cm and whose perimeter is 54 cm.

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During a publicity compaign, a cycle shop gave away 5000 miniature cycles and bumper stickers. The cycles cost $.63 each and the bumper stickers cost $.52 each. The cycle shop spen This question is on elimination...
4x-2y=-14
3x-y=-8

My answer was (-2 7/10,-12 4/10) Is this right, because it looks way too big to be the answer
thanks