Solve the system by the addition method. left brace Start 2 By 1 Matrix 1st Row 1st Column x plus y equals negative 4 2nd Row 1st Column x minus y equals 6 EndMatrix Question content area bottom Part 1 Select the correct choice below and, if necessary, fill in the answer box to complete your choice. A. There is exactly one solution. The solution set is StartSet nothing EndSet . (Simplify your answer. Type an ordered pair.) B. There are infinitely many solutions. The solution set is StartSet left parenthesis x comma y right parenthesis |x plus y equals negative 4 EndSet or StartSet left parenthesis x comma y right parenthesis |x minus y equals 6 EndSet. C. The solution set is empty set