Question

Quanto e x+3y=6
-4x+6y=-12

Answer 1

x+3y=6
-4x+6y=-12

x-(-4x)+3y-6y=6-(-12)
5x-3y=18
5x=3y+18
x=(3y+18)/5

x+3y=6
(3y+18)/5+3y=6
(3y+18+15y)/5=30/5
18y+18=30
18y=30-18
y=12/18
y=2/3

x=(3.2/3+18)/5
x=(6/2+18)/5
x=21/5
x=4,2