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y=-3x+5
4x+y=-11
3x+y=5 /*(-1)
4x+y=-11
-3x-y=-5
------------- +
x=-16
y=-4*(-16)-11
y=64-11
y=53
P=(-16 , 53)
-4x+3x=5+11
-x=16
x=-16
y=-4*(-16)-11=64-11=53
Odp. P=(-16, 53)