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Question 641473: A line L1 has slope (9/4). The line that passes through which of the following pairs of points is perpendicular to L1?
A.(3,3)and(-6,7)
B.(6,5)and(-6,9)
C.(3,-6)and(7,3)
D.(7,-6)and(7,3)
Found 2 solutions by stanbon, benni1013:
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! A line L1 has slope (9/4). The line that passes through which of the following pairs of points is perpendicular to L1?
A.(3,3)and(-6,7)
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slope = (7-3)/(-6-3) = 4/(-9) = -4/9
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Answer A
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Cheers,
Stan H.
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Answer by benni1013(206) (Show Source):
You can put this solution on YOUR website! When dealing with perpendicular, look for a slope that has the negative inverse. In this case, you are look for a pair of points that has a slope of -4/9.
I'm not going to give you the direct answer for this problem, but I will give you a couple of reminders.
First, the equation for slope is the change in y over the change in x. Second, whatever you get your first "y" you must get your first "x" from.
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