anonymous
  • anonymous
Two lines are perpendicular. If one line has a slope of 1/21 , what is the slope of the other line? A. -1/21 B. 1/21 C. 21 D. -21
Mathematics
chestercat
  • chestercat
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Compassionate
  • Compassionate
-21
Compassionate
  • Compassionate
-Snipped-
mathstudent55
  • mathstudent55
Perpendicular lines have slopes that are negative reciprocals. That isa fancy mathematical way of saying that if you have the slope of one line and you want the slope of a perpendicular to that line, filp the fraction and change the sign.

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mathstudent55
  • mathstudent55
1/21 Filp it: 21/1 = 21 Change sign: -21
anonymous
  • anonymous
Flip the sign and negate it. 1/21 becomes -1/21.Now flip. Becomes -21.

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