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 8091 views around the world You can reuse this answer Creative Commons License