KnowraVertical line (geometry)Linked fromLinked fromThe 3 pages that link to Vertical line (geometry), each with the reason it gives.All 3Compared with 3SlopeCompared with: Its zero horizontal change distinguishes it from lines with defined slope.Y-interceptCompared with: A vertical line on the y-axis meets it at infinitely many points, not a single intercept.Horizontal line (geometry)Compared with: It reverses which coordinate remains fixed and has undefined slope in Cartesian coordinates.