Question 810653: x^2 + y^2 = 9
2x^2 - y^2 = -6
Can you please help me out? Thanks so much in advance
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! x^2 + y^2 = 9
2x^2 - y^2 = -6
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Add to get:
3x^2 = 3
x^2 = 1
x = 1 or x = -1
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If x = 1, y^2 = 8. So y = 2sqrt(2) or y = -2sqrt(2)
If x = -1 you get the same result for "y":::
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Cheers,
Stan H.
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