SOLUTION: The perimeter of a rectangle is 38cm. one side is 11cm longer yhan the other side. find the lengths of the sides. I know one is 2w + 2l = 38 but I need to know what the other probl

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Question 318753: The perimeter of a rectangle is 38cm. one side is 11cm longer yhan the other side. find the lengths of the sides. I know one is 2w + 2l = 38 but I need to know what the other problem needed is, because its Solving Systems of Linear Equations by substitution. Please show me how to do the problem as well.
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
1.2W+%2B+2L+=+38
I switched to capital letters since the small L and the number 1 look similar.
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"one side is 11cm longer yhan the other side"
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Pick one to be longer, it doesn't matter which one you choose.
2.L=W%2B11
Those are your two equations.
Substitute eq. 2 into eq. 1,
2W%2B2%28W%2B11%29=38
2W%2B2W%2B22=38
4W%2B22=38
4W=16
highlight%28W=4%29
Then from eq. 2,
L=W%2B11
L=4%2B11
highlight%28L=15%29