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The lines y=m1x ,y=m2xa n dy=m3x make e...

The lines `y=m_1x ,y=m_2xa n dy=m_3x` make equal intercepts on the line `x+y=1.` Then (a) `2(1+m_1)(1+m_3)=(1+m_2)(2+m_1+m_3)` (b)`(1+m_1)(1+m_3)=(1+m_2)(1+m_1+m_3)` (c)`(1+m_1)(1+m_2)=(1+m_3)(2+m_1+m_3)` (d)`2(1+m_1)(1+m_3)=(1+m_2)(1+m_1+m_3)`

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