What is the slope of a line x=1? Algebra Graphs of Linear Equations and Functions Slope 1 Answer smendyka Apr 11, 2017 The equation #x = 1# describes a vertical line where #x# equals #1# for every value of #y#. 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 6530 views around the world You can reuse this answer Creative Commons License