How do you find slope given #x= - 4#? Algebra Graphs of Linear Equations and Functions Slope 1 Answer smendyka Mar 5, 2017 The equation #x = -4# is for a vertical line. By definition, the slope of a vertical line is undefined. Answer link Related questions What is Slope? How can slope be undefined? How do you calculate slope from a graph? How do you calculate the slope given two points? How does a positive slope differ from a negative slope? How does change in the slope affect the steepness of a line? Why is the slope of a horizontal line is zero? How do you determine the slope of #(3, –5)# and #(–2, 9)#? How do you determine the slope of #(1/3, 3/4)# and #(–2, 6)#? How do you determine the slope of #(2,7)# and #(7,2)#? See all questions in Slope Impact of this question 2615 views around the world You can reuse this answer Creative Commons License