I keep getting this question wrong!
The sum of the squares of the digits of a positive two digit number is 65. The difference between the two digits is 7. find all two-digit numbers that satisfy this statement. The correct answers are 81 and18. but i keep getting 1 and -8

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How did you set it up?

x^2+y^2=65
X-y=7

I substituted x for y+7 and plugged that into the X^2+y^2=65 equation.

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