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math

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a rectangle is 4 times as long as it is wide. a second rectangle is 5 centimeters longer and 2 centimeters wider than the first. the area of the second rectangle is 530 square centimeters greater than the first. what are the dimensions of the original rectangle?

  • math - ,

    L = 4 B
    L2=L + 5
    B2=B + 2

    (L+5)(B+2) = LB +530
    L B + 5B + 2 L + 10 = L B + 530

    5 B + 2 L = 520
    but L = 4 B
    so
    5 B + 8 B = 520
    13 B = 530
    B = 40.8
    L = 163

    LB = 6648
    (L+5)(B+2) = 7174
    difference = 525.6 pretty close

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