Question

método de sustitución

x-y=2
2x+y=2

Answer 1

Respuesta:

$y = 2 - 2x = 2 - 2 \times \frac{4}{3} = 2 - \frac{8}{3} = \frac{6}{3} - \frac{8}{3} = - \frac{2}{3} \\ x - (2 - 2x) = 2 \\ x - 2 + 2x = 2 \\ 3x - 2 = 2 \\ 3x = 2 + 2 \\ 3x = 4 \\ x = \frac{4}{3}$