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Question 81764: Determine which two equations represent parallel lines.
a)y=-9x+4
b)y=9x+4
c)y=1/9x+4
d)y=-9x+5
Answer by rapaljer(4671)   (Show Source):
You can put this solution on YOUR website! To determine if lines are parallel, you must know their slopes and decide which lines have the SAME SLOPE. In this case, the lines are all given in slope-intercept form, so the slopes is just the coefficients of x.
A) m=-9
B) m=9
C) m=1/9
D) m=-9
The two slopes that are EQUAL are A) and D), so these lines are PARALLEL!!
R^2 at SCC
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