Question

sistema: x=6
2x-7y=-10

Answer 1

2.6–7y=–10
12–7y=–10
–7y=–10–12
–7y=–22
y=–22÷–7
y=3,14

Answer 2

(2*6)-7y=-10
12-7y=-10
-7y=-10-12*(-1)
7y=10+12
7y=22
y=$\frac{22}{7}$