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Find the values of the parameter a so th...

Find the values of the parameter a so that the point (a, 2) is an interior point of the triangle formed by the lines x+y-4=0, 3x-7y-8=0and 4x-y-31 = 0.

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In ΔABC, after solving equation of AB, BC and CA
`x−y−4=0`
`3x−7y+8=0`
and `4x−y−31=0`, respectively
...
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