Answer :
[tex]x+3y=12\\
-4x+3y=-3\\\\
x+3y=12\\
4x-3y=3\\
------\\
5x=15\\
x=3\\\\
3+3y=12\\
3y=9\\
y=3\\\\
(3,3)[/tex]
-1*/x+3y=12
-4x+3y=-3
-x-3y= -12
-4x+3y= -3
+-------------------
-5x= -15
x=3
x+3y=12
3+3y=12
3y=9 y=3
(x,y)=(3,3)
-4x+3y=-3
-x-3y= -12
-4x+3y= -3
+-------------------
-5x= -15
x=3
x+3y=12
3+3y=12
3y=9 y=3
(x,y)=(3,3)