Line L passes through the points (1, 5) and (5, 8). What is the slope of a line that is perpendicular to line L?

-3/4
-4/3
3/4
4/3

Question

Line L passes through the points (1, 5) and (5, 8). What is the slope of a line that is perpendicular to line L?

-3/4
-4/3
3/4
4/3

hartnn · Answer

can you find the slope of a line given 2 points??

hartnn · Answer

The slope of the line through points (x1,y1) and (x2,y2) is given by :
$\huge m=\frac{y_1-y_2}{x_1-x_2}$
now,just put the values and find m.

anonymous · Answer

m=3/4

so thats my final answer?

hartnn · Answer

thats the slope of line L

but we need the slope of a line that is perpendicular to line L!

hartnn · Answer

the slope of perpendicular lines have product  = -1

hartnn · Answer

so m*(3/4) = -1

find m

anonymous · Answer

m=-4/3

hartnn · Answer

thats correct! :)

anonymous · Answer

Thank u!

hartnn · Answer

welcome ^_^