SOLUTION: Use the substitution method to find all solutions of the system of equations. x2 + y2 = 72 x + y = 0 Find larger value and smaller value

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Question 916662: Use the substitution method to find all solutions of the system of equations.
x2 + y2 = 72
x + y = 0

Find larger value and smaller value
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
x + y = 0 0r y = -x
x^2 + (-x)^2 = 72
x^2 + x^2 = 72
2x^2 = 72
x^2 = 36
x = ± 6
x is 6 and -6