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2x+4y=12
x+y=2
x+2y=6
x=2-y
2-y+2y=6
y=4
x+4=2
x=-2
b
x+y=5
3x-4y=2
x=5-y
3*(5-y)-4y=2
15-3y-4y=2
-7y=-13
y=13/7
y=35/7-13/7
y=22/7
2x+4y=12 |*(-3)
6x+6y=12
-6x-12y=-36
________________________
-6y=-24|/(-6)
y=4
3x+3y=6 |*4
2x+4y=12|*(-3)
12x+12y=24
-6x-12y=-36
___________________________
6x=12|/6
x=2
x=2
y=4