Target Exam

CUET

Subject

General Aptitude Test

Chapter

Quantitative Reasoning

Topic

Co-ordinate Geometry

Question:

The reflection of the point (6, -3) on the line $y = 2$ is:

Options:

(6, 3)

(6, 7)

(-6, 7)

(-2, 3)

Correct Answer:

(6, 7)

Explanation:

The correct answer is Option (2) → (6, 7)

To find the reflection of the point $(6, -3)$ across the line $y = 2$, we can follow these geometric steps:

1. Identify the Type of Reflection

The line $y = 2$ is a horizontal line. When you reflect a point across a horizontal line:

  • The $x$-coordinate remains exactly the same.
  • The $y$-coordinate changes based on its distance from the line.

2. Calculate the Vertical Distance

The original point is at $y = -3$. The line of reflection is at $y = 2$.

  • Distance from the point to the line $= |2 - (-3)| = 5$ units.

3. Determine the Reflected $y$-coordinate

Since the original point is 5 units below the line $(y=2)$, the reflected point must be 5 units above the line.

  • New $y$-coordinate $= 2 + 5 = 7$.

4. Combine the Coordinates

  • The $x$-coordinate stays $6$.
  • The new $y$-coordinate is $7$.
  • Reflected point: $(6, 7)$.

Conclusion

The reflection of the point $(6, -3)$ on the line $y = 2$ is $(6, 7)$