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Answered

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The length of a rectangle is 5 inches less than three times its width. The perimeter is 86 inches. Find the length and width. Write an equation and solve.

Please help me with the equation! I have no idea what to do!

Sagot :

CamilleEaton210
The equation for the perimeter of a rectangle is P =  2(l+w) P is perimeter, l = length, and w = width. Since the length is 5 less than the width, we could also say that l = w-5. Now, plug it into the equation.
86 = 2(w-5+w)
86 = 2(2w-5)
86 = 4w-10
86+10 = 4w-10+10
96 = 4w
96/4 = 4w/4
24 = w
Since the length is 5 less than the width, or 24, plug it in.
l = w-5
l = 24-5
l = 19
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