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Line A is perpendicular to line B. The slope of line A is -1/9 what is the slope of line b?

Line A is perpendicular to line B. The slope of line A is -1/9 what is the slope of line b?
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5 votes
Line A is perpendicular to line B. The slope of line A is -1/9 what is the slope of line b?

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User Cristea
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2 Answers

6 votes
The slope of the line is 9
answered
User Natalie Downe
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8.6k points
1 vote

\bf \stackrel{\textit{perpendicular lines have \underline{negative reciprocal} slopes}} {\stackrel{slope}{-\cfrac{1}{9}}\qquad \qquad \qquad \stackrel{reciprocal}{-\cfrac{9}{1}}\qquad \stackrel{negative~reciprocal}{+\cfrac{9}{1}}\implies 9}
answered
User Anthony Nichols
by
8.6k points
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