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3a+b=0
2a+b=-2
--------- _
a=2
6+b=0
b=-6
Odp. y=2x-6
-2 = 2a + b |*(-1)
0 = 3a + b
-a - b = 2
3a + b = 0
----------------
a = 2
b = -3 *2
b = -6
y = 2x - 6