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In response to your question:
“the length of a rectangle is 4 feet less than 3 times its width. the perimeter is 16 feet. what is its length.”
Step one: Write the sentence in equation form. Lets call the width W and the length L
If it’s easier translate one part of the sentence at a time starting with the multiplication first. So the first sentence now reads:
“The length of a rectangle is 4 feet less than 3W.”
Now translate the rest:
For the second sentence you need the formula for the perimeter W+L=perimeter= 16 feet.
Now there are 2 equations with two unknowns:
Substitute for L in equation (2):
W + (3W-4) =16,
Which simplifies to:
Substitute for this value of W in either equation (1) or (2). If I put it in equation (1) I get:
Substitute for L=5 and W=4 into equation (2) for the perimeter:
Since the left-hand-side is equal to the right-hand-side this is the correct answer.
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