What is the slope of the line for the equation y = -8? Algebra Graphs of Linear Equations and Functions Horizontal and Vertical Line Graphs 1 Answer smendyka Feb 9, 2017 By definition this is a horizontal line because the y value is the same for every x. Therefore the slope of this line is 0. Answer link Related questions What are horizontal or vertical line graphs? What would the (x,y) table look like for a horizontal and a vertical line graph? How do you graph y=4? What are some examples of when you would see horizontal or vertical line graphs? How do you graph x=−1? What is the equation for the x-axis? What is the equation for the y-axis? How do you graph y=12? How do you graph x=100? In which quadrant do the lines x=3 and y=−4 intersect? See all questions in Horizontal and Vertical Line Graphs Impact of this question 4467 views around the world You can reuse this answer Creative Commons License