Are the lines perpendicular? (1) Slopes are m and −1/m (2) Slopes are 2 and −1/2
AStatement (1) alone is sufficient; (2) is not.
BStatement (2) alone is sufficient; (1) is not.
CBoth statements together are sufficient; neither alone is.
DEach statement alone is sufficient.
EStatements together are not sufficient.
Answer & Solution
Correct answer: D. Each statement alone is sufficient.
1. (1) product = −1 → perpendicular. 2. (2) same condition. Each alone sufficient.
_Source: 501-GMAT-Questions Ch DS / Manhattan Quant Bank_
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