alg.
posted by lacy .
Determine which two equations represent perpendicular lines.
a) y=2x  6
b) y=1/2x + 6
c) y= 1/2x + 6
d) y= 1/2x  6
I know that perpendicular lines have negative recipricals, but I'm having trouble with this problem. I think the answer is b & c because they are both 1/2 and they have the (+6) and not (6). I'm really confused though, because 1/2 and 1/2 aren't really negative recipricals because its the same number. I was thinking it should be 2 and 1/2.(which would make it perpendicular) I'm lost! does the plus 6 and minus 6 matter??
The SLOPES of perpendicular lines are negative reciprocals. That means the product of the two slopes is 1. Clearly, this applies to (a) and (c), for which the slopes are 2 and 1/2.
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