GMAT 考满分题库

If lines and are perpendicular to each other, is the slope of line negative?

(1) line passes through the point

(2) the slopes of lines  and are negative reciprocals of each other

  • AStatements (1) and (2) TOGETHER are not sufficient.
  • BEACH statement ALONE is sufficient.
  • CBOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
  • DStatement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
  • EStatements (1) and (2) TOGETHER are not sufficient.
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正确答案: E

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