Question

comoresolver esse sistema x +3y=6 -x 6y=12

Answer 1

x+3y=6
-x+6y=12

x-x+3y+6y=6+12
0+9y=18
y=18/9
y=2

x+3y=6
x+3.2=6
x=6-6
x=0

Answer 2

x+3y=6
-x+6y=12
podemos anular o x.
3y+6y=18 fazendo a soma.
9y=18
y=2
x+3*2=6
x=-6+6
x=0
R:y=2
x=0