Pair of non-linear equations
CAT 2021 Slot 2 · Quantitative Ability · Medium · Quadratic Equations
This is a medium Quantitative Ability question from the CAT 2021 Slot 2 paper. It tests Quadratic Equations. The full answer key and a step-by-step explanation are below — try it yourself first, then reveal the solution.
Consider the pair of equations: and . If , then equals
- A.
8
- B.
6
- C.
7
- D.
4
Answer
A
Explanation
Equation 1: Equation 2:
Subtracting Equation 2 from Equation 1:
Also, adding Equation 1 and Equation 2:
Let . Then:
Since , , so .
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