Reflection of lines- Are they actually tested?

[rahulvsd]

Hi Experts,

Do we need to study the reflection of lines concept? Are they actually part of the test syllabus ?

[4GMAT_Mumbai]

Hi Rahul,

The rare questions on reflections usually involve only the x - axis, y - axis, x = y line and x = -y line.

I doubt if reflections on any other line will be asked.

Reflection of (a,b) on x-axis will be (a,-b)
Reflection of (a,b) on y-axis will be (-a,b)
Reflection of (a,b) on x=y will be (b,a)
Reflection of (a,b) on x=-y will be (-b,-a)

I hope this helps. Thanks.

[Brent@GMATPrepNow]

Hi Experts,

Do we need to study the reflection of lines concept? Are they actually part of the test syllabus?

Yes, I've seen some of these questions, but they are very rare.
I concur with 4GMAT_Mumbai - those reflections are all you need (although I've never seen a question involving a reflection across the line y = -x (a.k.a. x = -y)

Cheers,
Brent