Let bi = {(1,2), (-2, 4)} and b2 = {(1, -1), (0, (a) prove the set of vectors b, is independent. thus b, is a basis for r2 (b) compute pb1+b2. (c) let p(1,3)b, be a point given in coordinates in b1. what are the coordinates of p in the standard basis? what are the coordinates of p in the basis b2?