The formula can be used to find the width given the perimeter is (P-10)/8
Perimeter of a rectangle
The formula for calculating the perimeter of a rectangle is expressed as:
P = 2(l + w)
Given the perimeter is the length is 5 more than three times the width as;
P = 8w + 10
Mae w the subject of the formula
8w = P - 10
Divide both sides by 8
8w/8 = (P-10)/8
w= (P-10)/8
Hence the formula can be used to find the width given the perimeter is (P-10)/8
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