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Railways PYQCBT 1 2016

RRB NTPC · Question 30

If 4x + 5y = 14 and x – 5y = 16 then the value of x and y are A. 10 and –6/5 B. 6 and 2 C. 10 and 6/5 D. 6 and – 2

  1. B

  2. D

  3. C

  4. A

Show answer & explanation

Answer: (B) D

Explanation

Add the two equations to eliminate y: (4x + 5y) + (x − 5y) = 14 + 16, so 5x = 30 and x = 6. Substitute in x − 5y = 16: 6 − 5y = 16, so y = −2. The values are 6 and −2.