SOLUTION: The length of a rectangle is 4 cm longer than its width. If the perimeter of the rectangle is 28 cm, find its area.

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Question 928546: The length of a rectangle is 4 cm longer than its width. If the perimeter of the rectangle is 28 cm, find its area.
Answer by TimothyLamb(4379) About Me  (Show Source):
You can put this solution on YOUR website!
L = W + 4
2L + 2W = 28
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put the system of linear equations into standard form
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L - W = 4
2L + 2W = 28
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replace L with x
replace W with y
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x - y = 4
2x + 2y = 28
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copy and paste the above standard form linear equations in to this solver:
https://sooeet.com/math/system-of-linear-equations-solver.php
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solution:
x = L = 9
y = W = 5
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answer:
a = LW = 9*5 = 45 sq.cm.
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