OK this is a VERY basic question. A vector is a line on a graph representing something (Velocity, Displacement, ect...). Which is the best way to define a Vector:

1. Vector1 = (x1,y1,x2,y2) or

2. Vector1 = x1,y1, degree, magnitude


I working on a basic physics sim, so which would be easier? Or are both fine? Or are both wrong?