Question 971918
The slopes of parallel lines are equal.  The y-intercept gives b.  

y=6x  is parallel to y=6x-4 and goes through the origin, for when x=0, y=0 and therefore b=0

y-6x+8 is the other


{{{graph (300,300,-10,10,-10,10, 6x,6x-4,6x+8)}}}