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Show that the area of the triangle forme...

Show that the area of the triangle formed by the lines `y=m_1x+c_1,""""y=m_2x+c_2` and `x=0` is `((c_1-c_2)^2)/(2|m_1-m_2|)`

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Let us consider the given equations
`y = m1x —-(i)`
`y = m2x—-(ii)`
`y = c —-(iii)`
...
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