SOLUTION: DETERMINE WHICH 2 EQUATIONS REPRESENT PERPENDICULAR LINES. A)Y=9X-3 B)Y=1/9X+3 C)Y=-1/9X+3 D)Y=1/9X-3

Question 120884: DETERMINE WHICH 2 EQUATIONS REPRESENT PERPENDICULAR LINES.
A)Y=9X-3
B)Y=1/9X+3
C)Y=-1/9X+3
D)Y=1/9X-3
Found 3 solutions by checkley71, stanbon, ilana:
Answer by checkley71(8403)   (Show Source): You can put this solution on YOUR website!
A) Y=9X-3
C) Y=-1/9X+3 NAVE SLOPES OF 9 & -1/9 WHICH ARE NEGATIVE RECIPRICALS OF EACH OTHER THUS THEY ARE PERPENDICULAR LINES.
Answer by stanbon(75887)   (Show Source): You can put this solution on YOUR website!
A and C because the product of their slopes is -1.
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Cheers,
Stan H.
Answer by ilana(307)   (Show Source): You can put this solution on YOUR website!
These equations are in the form y=mx+b, where m is the slope of the line. Perpendicular lines have opposite reciprocal slopes. So for example, 2 and -1/2 are slopes of perpendicular lines. So are:
3 and -1/3
4 and -1/4
100 and -1/100
You should be able to pick the pair that fit with this pattern.
Good luck!

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