An ipod has a playlist with 12 songs. You select the shuffle option for the playlist. What is the probability that the songs are
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If two lines are perpendicular, the slope of one of the lines is the negative reciprocal of the other. Since we know the slope for one of our lines, 
m lets find the other:
Now, lets use the point-slope formula to complete the equation of our perpendicular line:
We can conclude that our perpendicular line is
Now, lets use the point-slope formula to complete the equation of our perpendicular line:
We can conclude that our perpendicular line is