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y=-b/2 x-1/2
-b/2 * a=-1
a=2/b
y=2/b x-1`/2
2/b*(-6)-1/2=-3
-12/b=7/2
7b=-24
b=-24/7
2/b=-2*7/24=-7/12
Odp. y=-7/12 x-1/2