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1=-2a+b
-6=4a-b
1=-2a-b
-2a=5/:-2
a=-2 1/2
6=-4x(-2 1/2)+b
6=10+b
-b=10-6/:-1
b=-4
y=-2,5x-4
-6=4a+b/x-1
6=3a+b
6=-4a-b
6=3a+b
12=-a
a=-12
-6=4x(-12)+b
-b=-48+6/:-1
b=42
y=-12x+42