The sum of two numbers is 13. two times the first number minus three times the second number is 1. if you let x stand for the first number and y for the second number, what are the two numbers?
 a. x = ���8, y = ���5
 b. x = 5, y = 8
 c. x = 8, y = 5
 d. x = ���5, y = ���8