The angle between the two lines y - 2x = 9 and x + 2y = - ;7, is … - Vidyadip

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The angle between the two lines $y - 2x = 9$ and $x + 2y = - \;7,$ is .....$^o$

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Answer

c
(c)These are perpendicular lines because ${m_1}{m_2} = (2)\left( {\frac{{ - 1}}{2}} \right) = - 1$

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