imo class 12 determinants

Solve by Cramer's rule: 5x − 3y = 8, 2x + y = 1. Then x + y equals:

VAVidaara Admin Asked 6d ago 0 views 0 answers

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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