X+y=−3 x−y=7 a) rewrite this system of equations in the format = where and are column vectors. b) rewrite the system of equations in the format = where and are row vectors. c) show that matrices and are invertible. d) find the inverses −1 and −1. e) use the inverses determined in part (d) to solve the system = for and the system = for (i. e. to determine the values of x and y).