Question

2x - y = -7
-3x + 4y = 13
X +2y = -1

Answer 1

Resposta:

A) $x=\frac{-7+y}{2}$

B) $x=-\frac{13-4y}{3}$

C) $X=-1-2y$

Explicação passo a passo:

A) $2x-y=-7$

$2x-y+y=-7+y$

$2x=-7+y$

$\frac{2x}{2}=-\frac{7}{2}+\frac{y}{2}$

$x=\frac{-7+y}{2}$

B) $-3x+4y=13$

$-3x+4y-4y=13-4y$

$-3x=13-4y$

$\frac{-3x}{-3}=\frac{13}{-3}-\frac{4y}{-3}$

$x=-\frac{13-4y}{3}$

C) $X+2y=-1$

$X+2y-2y=-1-2y$

$X=-1-2y$