# The equation of line AB is (y−3) = 5 (x − 4). What is the slope of a line perpendicular to line AB?

##### 1 Answer

Apr 30, 2017

#### Explanation:

#y-3=5(x-4)" is in "color(blue)"point-slope form"#

#"that is " y-y_1=m(x-x_1)#

#"where m represents the slope"#

#rArr"slope " =m=5#

#"the slope of a perpendicular line is the"#

#color(blue)"negative inverse of m"#

#rArrm_("perpendicular")=-1/5#