Solve by Cramer's rule: 5x − 3y = 8, 2x + y = 1. Then x + y equals:
Solve by Cramer's rule: 5x − 3y = 8, 2x + y = 1. Then x + y equals:
- A. 0
- B. 1
- C. 2
- D. −1
Answer: A) 0
Explanation: Δ = 5+6=11. Δₓ = 8+3=11 → x=1. Δᵧ = 5−16=−11 → y=−1. So x+y=0.
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