SOLUTION: I am so confused...need help please! Determine which two equations represent perpendicular lines. (a) y=2x-9 (b) y=1/2x+9 (c)y=-1/2x+9 (d) y=1/2x-9

Question 73809: I am so confused...need help please!
Determine which two equations represent perpendicular lines. (a) y=2x-9 (b) y=1/2x+9 (c)y=-1/2x+9 (d) y=1/2x-9
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
First, you have to know that given an equation that looks like
, the slope is . The equations that you
are given are all in that form. You can read off the slope in each case.
(a)
(b)
(c)
(d)
The slopes are all you care about. Forget the .
Now all you have to know is that if you have 2 lines
and , then the lines are parallel
If , then the lines are perpendicular
I see right away that (b) and (d) are parallel
And I see that (a) and (c) are perpendicular because
when and
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