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Reflection of lines- Are they actually tested?

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by 4GMAT_Mumbai » Tue Oct 11, 2011 10:21 pm
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.
Naveenan Ramachandran
4GMAT, Dadar(W) & Ghatkopar(W), Mumbai
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by Brent@GMATPrepNow » Wed Oct 12, 2011 6:21 am
rahulvsd wrote: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
Brent Hanneson - Creator of GMATPrepNow.com
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