Question

2x+3y=13............(I)
5x-4y=-2.............(II)
Luego calcular x²+y²

Answer 1

Por Regla de Cramer :

det = -8-15 = 23

x = (-52 + 6)/-23 = - 46/-23 = 2

y = (65 + 4)/-23 = 69/-23 = 3

x^2 + y^2 = 2^2 + 3^2 = 4+9 = 13