A: 1/2
a: -1/2
a: -2
a: 2
b: y-2=1/2 (x-1)
b: y-1= -1/2 (x-3)
b: y-1= 1/2 (x-3)
b: y+1= 1/2 (x+3)
b: y-2= 1/2 (x-1)
b: y+1= -1/2 (x+3)
b: y+2= -1/2 (x+1)

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