Math

The length of a rectangle is 5 inches less than 3 times the width. The perimeter of the rectangle is 14 inches. Find the length and width of the rectangle.

I did this: Length 3x-5; width 3x
Then I did guess and check and came up with X=2 solving the problem with a perimeter of 14. But, the answer is supposed to be length 4inches, width 3inches.

Please explain what I did wrong. I know the answer but not how to get it.

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  1. P = 2L + 2W

    14 = 2(3W - 5) + 2W

    14 = 8W - 10

    24 = 8W

    3 = W

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    Ms. Sue
  2. Ok, I get it now. Thank you.

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  3. :-)

    You're welcome.

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    Ms. Sue
  4. ok say if the hight is 6in and the length is 10 and it = 240 is the volume then what is the width

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