Question

Line a passes through points (6, 10) and (1, 1). Line b is perpendicular to a. What is the slope of line b?

Answer 1

Slope of line b: -5/9

Explanation:

(6,10) and (1,1)

m = (10-1)/(6-1)

m = 9/5

Answer 2

-5/9

Explanation:

Slope of line a is,

m = (1-10) / (1-6)

= (-9) / (-5)

= 9/5

Slope of line b is -1/m

-1/m = -1 / (9/5) = -5/9