Find the parametric equations of the lines L1, L2, L3 and L4 that pass through the indicated verticies of the square: http://img516.imageshack.us/img516/4052/parametrickl6.jpg [Broken] This isn't a homework question but I need some tutoring help here with parametric equations of lines, those who are good at linear algebra. Thanks. 3. The attempt at a solution L1 for example, is parallel to the y-axis a vector that's (0,1) A vector equation of the line is x=tv. If we let x = (x,y) this equation can be expressed in the component form as; (x,y) = t(0,1) (t is some scalar.) Therefore the parametric equation has to be: x = t.0 y = t [tex]\Rightarrow x = 0, y = t[/tex] But the correct answer in the textbook suggests: L1: x = 1, y = t Why did I get the wrong answer for x? I'm pretty confused right now I've been reading the book this afternoon and I still don't get it, I’m too tired to continue, I’m off to bed now!