Solve using augmented matrix methods. 16x_1+ 12x_2 = 4 -8x_1-6x_2 =-2 select the correct choice below and, if necessary, fill in the answer box to complete your choice. a. the unique solution is x, ad2(simplity your answer) the system has infinitely many solutions. the solution is x1 = and x2-t. (simplify your answer. type an expression using t as the variable. do not factor) b. c. there is no solution