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x + y = 1
X = ??
Jb : y = -x +1
X^2 + y^2 = 5
X^2 + (-x+1)(-x+1) = 5
X^2 + x^2 - x - x + 1 = 5
2x^2 - 2x = 4
2(x^2 - x ) = 4
X^2 - x = 2 <----- smua di bagi 2
x(x-1) = 2
X = 2
X-1 = 2
X = 3