WBCS.LIVE practice question

If x + y = 10 and x - y = 4, what is the value of x?

Solve this multiple-choice question and check the correct answer with its explanation below.

Answer options

  1. 3
  2. 6
  3. 7
  4. 8

Correct answer and explanation

Correct answer: 7

Explanation: āœ… Correct Answer: C) 7 šŸ“š Explanation: We can easily solve this linear system by simply adding the two algebraic equations together. Adding (x + y = 10) directly to (x - y = 4) completely eliminates the 'y' variable, giving 2x = 14. Dividing 14 by 2 gives the final, correct value of x, which is exactly 7.