If and , find the value of for which .

Answer and explanation

Correct answer: A.

  1. Step 1: Subtract equations: .
  2. Step 2: .
  3. Step 3: Substitute into : .
Answer
.
Why not the others: drops the negative sign from ; computes ; and doubles the slope.

Practise more Number Systems and Algebra.

Free questions with an explanation for every one, and full timed CBSE Class 10 mock tests.