math

if xy=7 and x-y=5, what are the values of x and y? please help!!!

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asked by Alyssa
  1. x * y = 7
    x - y = 5
    One method:

    express one variable in terms of the other variable and then solve the single variable expression.

    If x - y = 5
    then y = x - 5
    substituting back into the first equation:
    x * (x - 5)=7
    Solve for x, then substitue the x value into either equation to solve for y.
    You will probably need to use the quadratic formula to solve it.

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