SOLUTION: I am supposed to determine which two equations represent parallel lines: (a) y=-9x+4 (b) y=9x+4 (c) y=1/9x+4 (d) y=-9+5 How do I do this? Please Help.....

Question 82254: I am supposed to determine which two equations represent parallel lines:
(a) y=-9x+4
(b) y=9x+4
(c) y=1/9x+4
(d) y=-9+5
How do I do this? Please Help.....
Answer by Earlsdon(6294) (Show Source): You can put this solution on YOUR website!
Remember that parallel lines have equal slopes.
All of your equations are in the slope-intercept form: y = mx+b where m is the slope.
So, all you have to do is to find the two equations that have identical slopes.
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