5x - y over 3 =13
(2, -9), (3, -6)
a. both are solutions
b. neither is a solution
c. the first is a solution, but the second is not
d. the first is not a solution, but the second is

         (2, -9)
      5x - y = 13
         3
5(2) - (-9) = 13
       3
    10 + 9 = 13
         3
          19 = 13
           3
        6¹/₃ ≠ 13

        (3, -6)
     5x - y = 13
         3
5(3) - (-6) = 13
       3
    15 + 6 = 13
        3
          21 = 13
           3
            7 ≠ 13

The answer to that problem is B. Neither is a solution.