Are l1 and l2 parallel?

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BTGmoderatorAT: Moderator; Posts: 426; Joined: Tue Aug 22, 2017 8:48 pmFollowed by: 1 member

by BTGmoderatorAT » Wed Sep 20, 2017 4:08 am

Are l1 and l2 parallel?

(1) l1 intersects l3 at a 45Â° angle.

(2) l3 intersects l2 at a 45Â° angle.

What's the best way to determine whether statement 1 is sufficient?

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Source: Beat The GMAT — Data Sufficiency | Wed Sep 20, 2017 4:08 am

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Jay@ManhattanReview: GMAT Instructor; Posts: 3008; Joined: Mon Aug 22, 2016 6:19 amFollowed by: 34 members; Location: Grand Central / New York; Thanked: 470 times

by Jay@ManhattanReview » Wed Sep 20, 2017 10:51 pm

ardz24 wrote:Are l1 and l2 parallel?

(1) l1 intersects l3 at a 45Â° angle.
(2) l3 intersects l2 at a 45Â° angle.

What's the best way to determine whether statement 1 is sufficient?

Statement 1: L1 intersects L3 at a 45Â° angle.

It does not provide any information about L2. Insufficient.

Statement 2: L3 intersects L2 at a 45Â° angle.

Does not provide any information about L1. Insufficient.

Statement 1 & 2:

Refer to the image; L1 and L2 can be either perpendicular or parallel.

No unique answer.

The correct answer: E

Hope this helps!

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