SOLUTION: given the two points, A(5,-1) and B (15,4) a. find the slope of the line joining the points A and B b. if EF is perpendicular to AB, find the slope of EF?

Question 775865: given the two points, A(5,-1) and B (15,4)
a. find the slope of the line joining the points A and B
b. if EF is perpendicular to AB, find the slope of EF?
Answer by mananth(16946) (Show Source): You can put this solution on YOUR website!
x1 y1 x2 y2
5 -1 15 4

slope m = (y2-y1)/(x2-x1)
( 4 - -1 )/( 15 - 5 )
( 5 / 10 )
m= 1/ 2

slope of a perpendicular line will be the negative reciprocal of the slope of the given line
m=-2
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