Asked by Alyssa
if xy=7 and x-y=5, what are the values of x and y? please help!!!
Answers
Answered by
Quidditch
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.
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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