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Math Help - Solving an equation

  1. #1
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    Solving an equation

    *The product of two numbers is 10 -----------------------> ab = 10 ..........(1)
    *One number is 3 more than the other number --------> a = b + 3 ........(2)

    Substitute the two equations. ^^

    Do I use -5 for a and 2 for b? I am not quite sure what you mean by "substitute the two equations."
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  2. #2
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    Quote Originally Posted by bobbyboy1111 View Post
    *The product of two numbers is 10 -----------------------> ab = 10 ..........(1)
    *One number is 3 more than the other number --------> a = b + 3 ........(2)

    Substitute the two equations. ^^

    Do I use -5 for a and 2 for b? I am not quite sure what you mean by "substitute the two equations."
    It means you replace the a in equation (1) with the expression for a given in equation (2) so that you have a single equation that you use to solve for b.
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  3. #3
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    b + 3(b) = 10?

    Like this?
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  4. #4
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    Quote Originally Posted by bobbyboy1111 View Post
    *The product of two numbers is 10 -----------------------> ab = 10 ..........(1)
    *One number is 3 more than the other number --------> a = b + 3 ........(2)
    a = b+3

    substitute (b+3) for a in the first equation ...

    (b+3)b = 10

    distribute on the left and solve the quadratic equation.
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  5. #5
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    Thanks Skeeter
    Last edited by mr fantastic; August 11th 2009 at 05:59 PM.
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