a line L1 has a slope 5/6. the line that passes through which of the following pairs of points is perpendicular to L1
(1,-4) and (-4,-2)
(2,4) and (3,-2)
(3,3) and (2,-3)
(0,4) and (5,-2)

Question

a line L1 has a slope 5/6. the line that passes through which of the following pairs of points is perpendicular to L1 
(1,-4) and (-4,-2)
(2,4) and (3,-2)
(3,3) and (2,-3)
(0,4) and (5,-2)

shubhamsrg · Answer

any idea/attempt ?

anonymous · Answer

no idea cause idk what its asking

shubhamsrg · Answer

the required line is perpendicular to the given line. The given line has a slope 5/6
So the required line has a slope.. ?

anonymous · Answer

-6/5

shubhamsrg · Answer

Correct.
Now can you tell me the slope of the line which passes through the points (x1,y1) and (x2,y2) ?

shubhamsrg · Answer

1 and 2 are in subscripts

shubhamsrg · Answer

problem ?

anonymous · Answer

yeah cause i dont know how to do that

shubhamsrg · Answer

If a given line passes through the points (x1,y1) and (x2,y2) , then its slope is given by
(y2 -y1)/(x2 -x1)

texaschic101 · Answer

use the slope formula : slope = (y2 - y1) / (x2 - x1) to find the slopes of the points given. Whichever one has a slope of -6/5 is your perpendicular line