Write an expression that produces a given resultant vector. a) Write an expression that can be used to produce vector b from vector a, and explain how you determined that expression. (4 points) y 8 7+ 6 5 2 4 3 -5 -4 -3-2 -1 2 3 4 5 -2 r 8 7 b 6- . -5 -4 T = 5+ 4 3 x -3 -2 -1 1 2 3 4 5 -2