Solve using augmented matrix methods. 4x + 3x= -5 3x, x = -7 Select the correct choice below and, if necessary, fill in the answer box to complete your choice. OA. The unique solution is x = and x = OB. The system has infinitely many solutions. The solution is x = (Simplify your answer. Type an expression using t as the variable.) - OC. There is no solution. Use row operations to change the matrix to reduced form. 10-3 1 0 2 -8 01 00 NO 6 10-3 1 01 6 0 00 2 -8 Maximize subject to (Simplify your answers. Write the e-system obtained via slack variables for the given linear programming problem. 3x +7x 5x, +Bxy 510 2x7x = 12 X X20 P= and X = t. Write the associated linear equation for the inequality 5x, + 8x 10. Uses, as the slack variable. (Type an equation. Do not factor.) Write the associated linear equation for the inequality 2x, +7x2 12. Use s as the slack variable. (Type an equation. Do not factor.)