Mathematics, 03.07.2019 07:00 anime1546
If the product of the two slopes of two lines equals -1, then the lines are ?
Answers: 1
![\bf \stackrel{\textit{perpendicular lines have \underline{negative reciprocal} slopes}} {\stackrel{slope}{\cfrac{a}{b}}\qquad \qquad \qquad \stackrel{reciprocal}{\cfrac{b}{a}}\qquad \stackrel{negative~reciprocal}{-\cfrac{b}{a}}} \\\\[-0.35em] \rule{34em}{0.25pt}\\\\ ~\hfill \left( \cfrac{a}{b} \right)\left( -\cfrac{b}{a} \right)=-1~\hfill](/tpl/images/0045/5063/00ba0.png)
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If the product of the two slopes of two lines equals -1, then the lines are ?...
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