# How do you find the slope of a line perpendicular to #y=-8#?

##### 1 Answer

Jun 13, 2018

#### Explanation:

#"the equation "y=-8#

#"is a horizontal line parallel to the x-axis and passing"#

#"through all points in the plane with a y-coordinate of "-8#

#"since it is parallel to the x-axis it's slope "=0#

#"a line perpendicular to it would therefore be a vertical"#

#"line parallel to the y-axis"#

#"with undefined slope"#