x+y=170 (-1)
2x+y=-400 (-1)
x+2y= 150
-------------------------
-x-y=-170
+ -2x-y=400
x+2y = 150
_____________
-2x + 0y = 380
x = -190
--------------------------
x+y=170
-190+y =170
y= 190+170
y = 360
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x+y=170 (-1)
2x+y=-400 (-1)
x+2y= 150
-------------------------
-x-y=-170
+ -2x-y=400
x+2y = 150
_____________
-2x + 0y = 380
x = -190
--------------------------
x+y=170
-190+y =170
y= 190+170
y = 360