What is the coordinates of v=(3,5)v = (3, 5)v=(3,5) in the basis B={(1,2),(2,1)}B = \{(1, 2), (2, 1)\}B={(1,2),(2,1)}?
(7/3,1/3)(7/3, 1/3)(7/3,1/3)
(1,1)(1, 1)(1,1)
(3,5)(3, 5)(3,5)
(2,1)(2, 1)(2,1)