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