Determine a cartesian equation of the line passing through A and V as a direction vector?

1- A (2;1) and V = j

2- A (2;3) and V = i

Thank you,



Let's look at the second problem. The vector i is the unit vector pointing in the x-direction as in the diagram.

So the line you want is the horizontal line (slope 0) that passes through (2,3). What is the equation of that line?

The vector j points in the y-direction so the line you want in the first question is vertical.