We certainly need information about both lines to answer the question, so neither statement could be sufficient alone.
From statement 1, we know two points on line L - we know (0,0) and (1,2) are on the line. From two points, we can find a slope. From statement 2, we know two points on line K - we know (4, 0) and (0,2) are on the line. Again, from two points we can find a slope. Since using both statements, we can find the slopes of L and K, we could certainly determine if the product of these slopes is -1 and thus answer the question. So the answer is C.
Notice that we don't actually need to do any calculations here, since it's Data Sufficiency; we only need to know if it will be possible to answer the question.
gmatpre - xy plane
This topic has expert replies
Source: Beat The GMAT — Data Sufficiency |
GMAT/MBA Expert
-
Ian Stewart
- GMAT Instructor
- Posts: 2623
- Joined: Mon Jun 02, 2008 3:17 am
- Location: Montreal
- Thanked: 1090 times
- Followed by:355 members
- GMAT Score:780
For online GMAT math tutoring, or to buy my higher-level Quant books and problem sets, contact me at ianstewartgmat at gmail.com
ianstewartgmat.com
ianstewartgmat.com
