Recent content by KitKat21

Where would I find these formulas? I have tried google and come up with nothing...?

Homework Statement A group of American physicist works on a project where planar lines are in the form X=tP+sQ, where P and Q are two fixed different points and s, t are varying reals satisfying s+t=1. They need to know formulae for the images of the line X=tP+sQ in the following three cases...