Thursday, February 20, 2014

Find the equation of the line passing through (0,0) making an angle of Arctan 1/2 from the line 3y=2x

We want to find the equation of the line passing through the origin that makes an angle of arctan=1/2 with the line 3y=2x:


The slope of the given line is 2/3, and the given line also passes through the origin.


The angle between the lines is related by the following:


`tan theta = (m_1-m_2)/(1+m_1m_2) `


Since the angle is arctan (1/2), we know that `tan theta = 1/2 `


Then ` 1/2=(m-2/3)/(1+m*2/3) ` where m...

We want to find the equation of the line passing through the origin that makes an angle of arctan=1/2 with the line 3y=2x:


The slope of the given line is 2/3, and the given line also passes through the origin.


The angle between the lines is related by the following:


`tan theta = (m_1-m_2)/(1+m_1m_2) `


Since the angle is arctan (1/2), we know that `tan theta = 1/2 `


Then ` 1/2=(m-2/3)/(1+m*2/3) ` where m is the slope of the required line.


So `1/2+1/3m=m-2/3 `


`2/3 m = 7/6 ==> m=7/4 `


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The equation is y=7/4x or 4y=7x


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The given line and the required line:



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