Straight line vertical line Equation Calculator tool（vertical line of dots ）
straight line Equation ： ax + by = c drop:(x1,y1)
vertical line of dots ：Y = (b/a)X - (b/a)x1 + y1
straight line Equation ： ax + by = c drop:(x1,y1)
vertical line of dots ：Y = (b/a)X - (b/a)x1 + y1