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7=-4a+b
2=6a+b
-7=4a-b
2=6a+b
-5=10a
a=-1/2
2=-3+b
b=5
y=-1/2x+5
b)
-1=-3a+b
1=3a+b
0=2b
b=0
1=3a
a=1/3
y=1/3x