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kimye21
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The length of a rectangle is 7 inches more than the width. The perimeter is 42 inches. Find the length and width
 2 years ago
 2 years ago
kimye21 Group Title
The length of a rectangle is 7 inches more than the width. The perimeter is 42 inches. Find the length and width
 2 years ago
 2 years ago

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kimye21 Group TitleBest ResponseYou've already chosen the best response.0
dw:1348706471681:dw
 2 years ago

dpflan Group TitleBest ResponseYou've already chosen the best response.1
Cool, so for that rectangle, perimeter is 42. How do you find the perimeter?
 2 years ago

dpflan Group TitleBest ResponseYou've already chosen the best response.1
Do you know the formula for finding the perimeter of an object?
 2 years ago

kimye21 Group TitleBest ResponseYou've already chosen the best response.0
i think its p=2l+2w
 2 years ago

dpflan Group TitleBest ResponseYou've already chosen the best response.1
yeah, in this case for the rectangle, P = 2*length + 2*width. So you have values for the length and the width, right? L = x + 7 W = x
 2 years ago

dpflan Group TitleBest ResponseYou've already chosen the best response.1
Plug those values into the perimeter function, what does the equation look like after doing that?
 2 years ago

kimye21 Group TitleBest ResponseYou've already chosen the best response.0
my equation looks like this 42=2(7)+2w 4214=28 which makes w = 14 then for L 14+7=21 am i right
 2 years ago

dpflan Group TitleBest ResponseYou've already chosen the best response.1
Getting there, so the values you have for each dimension are actually variables  (x+7), and x Therefore P = 2*L + 2*W becomes L = x + 7 W = x P = 2*(x+7) + 2*(x) 42 = 2*(x+7) + 2*(x)
 2 years ago

dpflan Group TitleBest ResponseYou've already chosen the best response.1
Because there is only one variable, one unknown, that being 'x', we can easily then solve for it from the adjusted equation.
 2 years ago

dpflan Group TitleBest ResponseYou've already chosen the best response.1
Does that make sense? Give that equation a shot, and solve for x.
 2 years ago

dpflan Group TitleBest ResponseYou've already chosen the best response.1
Definitely! that's it, so L = ? and W = ?
 2 years ago

dpflan Group TitleBest ResponseYou've already chosen the best response.1
Just have to do that last step and you're donw
 2 years ago

dpflan Group TitleBest ResponseYou've already chosen the best response.1
Quite easy after finding x...
 2 years ago

kimye21 Group TitleBest ResponseYou've already chosen the best response.0
so w = 7 and l=14
 2 years ago
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