How do you find the slope of a line with this: y=18? Algebra Graphs of Linear Equations and Functions Slope 1 Answer Acquaintance Jul 12, 2016 Slope: #0# Explanation: The slope of a line #y=18# is zero. When graphed, the line is a straight, horizontal line. It does not increase or decrease, it stays straight. 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 1461 views around the world You can reuse this answer Creative Commons License