The length of a rectangle is 3 more than 4 times its width. The perimeter of the rectangle is 86 inches.
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what is the length of the rectangle
so, we don't know the width of the rectangle, so we can call that x. Then, the length of the rectangle we don't know either, but it tells us that its 3 more than 4 times the width. Therefore, we can write it in an equation as 4x+3 (4 times the width, which is x, plus 3). Then, you would have to use those equations to set up another equation to solve for what x would be. Since the perimeter of that rectangle is 86, we can use that to set up our equation. If the sides of a rectangle added up is the perimeter, we can create an equation by saying (4x+3) + (4x+3) + x + x = 86. Then you'd simplify, and then solve for x, which should come out to be 8. Then you'd plug that into the original equation for the length (4x+3) and that should give you the length of your rectangle :)