How do you write the equation of the vertical line passing through (-1,3)? Algebra Graphs of Linear Equations and Functions Horizontal and Vertical Line Graphs 1 Answer smendyka Jan 7, 2017 Because this is a vertical line the #x# value will not change and be the same for every value of #y#. Therefore the equation is" #x = -1# 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=1/2#? 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 7658 views around the world You can reuse this answer Creative Commons License