SOLUTION: one side of a rectangle is three feet more than half as long as the other side and the perimeter is 21 feet what are the dimensions of the rectangle

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Question 359491: one side of a rectangle is three feet more than half as long as the other side and the perimeter is 21 feet what are the dimensions of the rectangle
Answer by robertb(4012) About Me  (Show Source):
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one side of a rectangle is three feet more than half as long as the other side and the perimeter is 21 feet what are the dimensions of the rectangle.
Let x, y be the sides of the rectangle.
y+=+%281%2F2%29x%2B3, and 2x%2B2y+=+21.
By substitution,
2x+%2B+2%2A%28%281%2F2%29x%2B3%29+=+21,
2x%2Bx%2B6+=+21,
3x+=+15,
x+=+5.