How do you find the slope of the line 3x+6=12? Algebra Graphs of Linear Equations and Functions Slope 1 Answer smendyka Feb 10, 2017 Because there is no #y# term in this equation this is a vertical line. By definition, a vertical line has an undefined 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 1214 views around the world You can reuse this answer Creative Commons License