y=-x-2
y=-1/2x´+2
y=4x-1/2
y=2/3x+5
y=3x-2
y=-2x+1
y=-2x+3
y=2x-1
b=-1
m=-1
m=-2
m=3
b=+2
b=+3
b=-1/2
m=2/3
