Answer: 8 and 5Step-by-step explanation:LET:x=First Numbery=Second NumberSolution: Sum is 13 x+y=13 x=13-y (Equation 1) Difference is 3 x-y=3 Substitute Equation 1 in x-y=3 13-y-y=3 13-2y=3 2y=13-3 y=10/2 y=5 (ANSWER) Substitute y=5 in equation 1 x=13-5 x=8 (ANSWER)