Question

me ajude equação x-3y=-7

Answer 1

Olá,

$x-3y=-7\\ x= 3y-7\\ (3y-7)-3y=-7\\ 0+-7=-7\\ 7-7=0\\ x=0 \\\\ 3y-7=0\\ 3y=7\\ y= \frac{7}{3} \\\\ 0-3\cdot \frac{7}{3}=-7\\\\ - \frac{21}{3}= -7$

Espero ter ajudado!