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सिद्ध कीजिए की बिंदु (-4,5) और (-5,7) से होकर जाने वाली रेखा बिंदु (1,m) से होकर जाएगी, यदि `2l+m+3=0`.

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बिन्दुओ (-4,5) तथा (-5,7) से होकर जाने वाली रेखा का समीकरण
`y-5=(7-5)/(-5+A)(x+4)`
या `y-5=-(2)/(1)(x+4)`
या `y-5=-2x=8`
या `2x+y+3=0`
जब यह रेखा (l,m) बिंदु से होकर जाती है, तब
`2l+m+3=0`.

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