BieberJustin
what is the perimeter and lenght of a rectangle if area=515.97 and width=18.9 ....???



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Decart
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2widths and 2lenghts give perimeter. and length times width is area you have to unkowns in two equations solve for one then substitute

Decart
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\[2l+2w=perimeter\]

Decart
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\[lw=area(515.97)\]

Decart
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substitute 18.9 for w and solve for l in the second equation

BieberJustin
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how do i get the lenght??

Decart
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what do you get

Decart
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in the second equation lenght times width equalls area subtitute 18.9 then solve for l by dividing both sides of the equation by w

BieberJustin
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is it right?? i get 27.3 for the leght... can you please check it if it is right... :d

Decart
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yes

Decart
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now substitute l and w in the first equation to get the perimeter.

BieberJustin
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so what is the p??

BieberJustin
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thanks!

Decart
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2l+2w=perimeter