I assume you mean X^2 + Y^2 = 13

X^2 +(2)^2 = 13

X^2 + 4 = 13

X^2 = 9 (Take square root each side)

**X = (+/-) 3**

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I assume you mean X^2 + Y^2 = 13

X^2 +(2)^2 = 13

X^2 + 4 = 13

X^2 = 9 (Take square root each side)

**X = (+/-) 3**

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