Problem
(8) The sum of two numbers is 3 . Their difference is 13 . What are the two numbers? (A) \( (8,5) \) (B) \( (8,-5) \) (C) \( (1,2) \) (D) \( (20,7) \)
Solution
Step 1 ：1. \( x + y = 3 \)
Step 2 ：2. \( x - y = 13 \)
Step 3 ：3. Solve \( x = 8, y = -5 \)
