Find the conditions that the straight li...

Find the conditions that the straight lines `y=m_1x+c_1, y=m_2x+c_2a n d\ y=m_3x+c_3` may meet in a point.

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We have,
`y= m_1x+c_1` .......(i)
`y = m_2x+c_2` ........(ii)
`y = m_3x+c_3` ..........(iii)
...

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