(1 point) For the simplex tableau x1 X2 31 $2 P RHS 3 5 1 1 100 0 0 49 1 0 42 0 1 0 -7-12 perform one pivot operation and enter the resulting tableau below. The pivot element has a box around it. x 1 0 x2 $1 $2 0 0 1 0 0 1 P RHS