Question 1069765
L = 4W+3
2L+2W = 56 Substitute for L:
2(4W+3)+2W = 56 Distribute the 2 over the terms in the parenthesis
8W+6+2W = 56
10W = 50 
Divide both sides by 10:
10W/10 = 50/10 
W = 5
L = 4(5)+3 = 23
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Check:
2L+2W = 56
2(23)+2(5) = 56
46+10 = 56 I'm giving you the correct answer.
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Cheers,
john