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    stargirl44's Avatar
    stargirl44 Posts: 1, Reputation: 1
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    #1

    Mar 29, 2009, 04:10 PM
    Quadratic word problems
    The width of a rectangle is 11 inches less than its length. Find the dimensions of the rectangle if the area is 80 square inches.

    The length of a rectangle exceeds its width by 3 inches. The area of the rectangle is 70 square inches find its dimensions.

    The length of a rectangle is twice the width. The area is 50 square inches find the dimensions of the rectangle.
    Perito's Avatar
    Perito Posts: 3,139, Reputation: 150
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    #2

    Mar 29, 2009, 08:24 PM


    W = width
    L = length





    you now have two equations and two unknowns. Do you know how to solve that? The most straight-forward way is to take the first equation, W=L-11, and substitute "L-11" for "W" in the second equation. Then solve for L.

    The other problem is solved in the same way.
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