Posted by lisa on Monday, July 8, 2013 at 11:43am.
The length of a rectangle is 4 m less than the diagonal and the width is 7 m less than the diagonal. If the area is 76 m2, how long is the diagonal? Round your answer to the nearest tenth.

algebra1 HELP PLEASE  Steve, Monday, July 8, 2013 at 11:56am
If the sides are x and y, and the diagonal is d,
x = d7
y = d4
so,
d = x+7 = y+4
That is, y = x+3
xy = 76, so
x(x+3) = 76
x = 7.35
So, the rectangle is 7.35 x 10.35
area = 76
diagonal is 12.69
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