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OpenStudy (anonymous):
MEDAN AND FAN QUESTION IN COMMENTS
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OpenStudy (anonymous):
Directrix (directrix):
If two lines are perpendicular, then the slopes of the two lines multiply to -1. Your posted line has a slope of -4/5. The slope of the perpendicular line on which the option points would have to lie is 5/4. Use the slope of a line formula to figure out which pairs of points in the options have a slope of 5/4.
OpenStudy (anonymous):
slope=(y1-y2)/(x1-x2) perpendicularity means slope is the negative reciprocal of the original line in this case, I believe only the first and the last are perpendicular
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