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a)
y=4x+b
4*1+b=2
b=2-4
b=-2
y=4x-2
b)
y=-1/5 x+b
-1/5* 20+b=9
-4+b=9
b=13
y=-1/5 x+13
c)
y=1/8 x+b
1/8 * (-16)+b=-3
-2+b=-3
b=-1
y=0,125x-1
d)
y=-4