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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
 one year ago
 one year 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
 one year ago
 one year ago

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kimye21 Group TitleBest ResponseYou've already chosen the best response.0
dw:1348706471681:dw
 one year 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?
 one year ago

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

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

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

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

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

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