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x^2 - 5xy = 0 (1)
- x^2 + 4y = 0 (2)
De (2)
4y = x^2
y = x^2/4 (3)
(3) en (1)
x^2 - 5x(x^2/4) = 0
4x^2 - 5x^3 = 0
x^2(4 - 5x)
x^2 = 0
x1 = x2 = 0
4 - 5x = 0
4 = 5x
x = 4/5
x3 = 4/5
x en en (2)
- (4/5)^2 + 4y = 0
4y = 16/25
y = (16/25)/4
= 4/25
y = 4/25
SOLUCIÓN DEL SISTEMA
x1 = x2 = 0
x3 = 4/5
y = 4/25
Compruébalo !!!