Question

{x+2y=y+2
{2x-1/2=7-y/3

Método da adição

Answer 1

Resposta:

A) $x=-y+2$

B) $x=\frac{45-2y}{12}$

Explicação passo a passo:

A) $x+2y=y+2$

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

$x=-y+2$

b) $2x-\frac{1}{2}=7-\frac{y}{3}$

$2x-\frac{1}{2}+\frac{1}{2}=7-\frac{y}{3}+\frac{1}{2}$

$2x=\frac{15}{2}-\frac{y}{3}$

$\frac{2x}{2}=\frac{\frac{15}{2}}{2}-\frac{\frac{y}{3}}{2}$

$x=\frac{45-2y}{12}$