x+y=-40
x-y=-160
----------
2x=-200
x=-100
-100+y=-40
y=-40+100
y=60
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x+y=-40
x-y=-160
----------
2x=-200
x=-100
-100+y=-40
y=-40+100
y=60
x-y=-160
________
2x=-200
x=-100
-100+y=-40
y=60
x=-100
y=60
x-y=-160
-----------
2x=-200/2
x=-100
podstawiamy
x+y=-40
-100+y=-40
y=-40+100
y=60
x=-100
sprawdzamy
x-y=-160
x-60=-160
x=-160+60
x=-100