Question 404555
Dave and Jane Wells have a new rectangle driveway.  The perimeter of the driveway is 168 feet.  The length is 12 feet longer then three times the width.  What are the dimensions of the driveway?
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Let w = width
then
3w+12 = length
.
2(w + 3w+12) = 168
2(4w+12) = 168
(4w+12) = 84
4w = 72
w = 13 feet (width)
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Length:
3w+12 = 3(13)+12 = 39+12 = 51 feet