Question 1025044
2l+2w = 90 (1)
and 
l = 4w-5 Use this value for l in equation (1):
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2(4w-5)+2w = 90
8w-10+2w = 90
10w = 100
w = 10 so this is the width. And the length:
l = 4w-5 = 4(10)-5 = 40-5 = 35 The length is 35
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Check:
2(35)+2(10) = 70+20 = 90 Correct.