width of a rectangle /word problem  TOPIC_SOLVED

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width of a rectangle /word problem

Postby deborah singletary on Sun Nov 22, 2009 4:46 am

suppose that the width of a rectangle is three feet shorter than length and that the perimeter of the rectangle is 84 feet. set theequation for perimeter involving only L, the length of rectangle. :!:
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Re: width of a rectangle /word problem  TOPIC_SOLVED

Postby nona.m.nona on Sun Nov 22, 2009 12:51 pm

They give you width in terms of length, so pick a variable for the length. Come up with an expression for the width in terms of this variable, so the expression means "the length, less three". Insert the variable and the expression into the formula for the perimeter, and subsitute the perimeter value they gave you for the P in the perimeter formula. This will give you the equation you need.
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