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x² + y² = 5
x + y = 3
y = 3 - x
y² = 9 - 6x + x²
x² + 9 - 6x + x² = 5
2x² - 6x + 4 = 0
x² - 3x + 2 = 0
(x - 1)(x - 2) = 0
x1 = 1 --> y1 = 3 - 1 = 2
x2 = 2 --> y2 = 3 - 2 = 1
pronto
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x² + y² = 5
x + y = 3
y = 3 - x
y² = 9 - 6x + x²
x² + 9 - 6x + x² = 5
2x² - 6x + 4 = 0
x² - 3x + 2 = 0
(x - 1)(x - 2) = 0
x1 = 1 --> y1 = 3 - 1 = 2
x2 = 2 --> y2 = 3 - 2 = 1
pronto