Question

5x + 2y = 11

2x - 3y = 12

hallar (x+y)-2

Answer 1

respuesta = -1

Explicación paso a paso:

$3(5x + 2y = 11 \\ 2(2x - 3y = 12$

$15x + 6y = 33 \\ 4x - 6y = 24$

$15x = 33 \\ 4x = 24 \\ 19x = 57 \\ x = \frac{57}{19} \\ x = 3$

reemplazamos lo anterior

$5x + 2y = 11 \\ 5(3) + 2y = 11 \\ 15 + 2y = 11 \\ 2y = 11 - 15 \\ 2y = - 4 \\ y = \frac{ - 4}{2} \\ y = - 2$

hallar (X+y)-2

$(3 +( - 2)) - 2 \\ (3 - 2) - 2 \\ 1 - 2 = - 1$