How do you find the slope for x = -2x=−2? Algebra Graphs of Linear Equations and Functions Slope 1 Answer Shura May 19, 2015 The slope of a vertical line (i.e. x = ax=a) is undefined (or you could say it is oo∞). In opposition, the slope of an horizontal line (i.e. y = ay=a) is 00 since the standard form of a linear function is y=mx+ay=mx+a, where mm is the slope. 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 1850 views around the world You can reuse this answer Creative Commons License