MATH!!!!!!

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the sum of two numbers is 99, the difference of those two numbers is 9. what are the two numbers???

  • MATH!!!!!! -

    I believe 54 and 45 would work.

  • MATH!!!!!! -

    yep it does ty...it was an easy problem i just didn't feel like solving it so thnx =]

  • MATH!!!!!! -

    But no work was shown. Was this just trial and error, or was math used?

    "the sum of two numbers is 99"
    x + y = 99

    "the difference of those two numbers is 9."
    x - y = 9

    Solve one equation for either variable.
    x - y = 9
    x = y + 9

    now substitute this value for x into the other equation.
    x + y = 99
    (y + 9) + y = 99
    2y + 9 = 99
    2y = 90
    y = 45

    Now substitute that numeric value for y into one of the original equations to find the numeric value of x.
    x + y = 99
    x + 45 = 99
    x = 54

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