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उस सरल रेखा का समीकरण ज्ञात कीजिए जिसका x अक्ष पर अन्तः खण्ड 4 इकाई है तथा जो बिन्दुओ ( 2,-3) तथा (4,2) को मिलाने वाले रेखाखण्ड पर लम्बवत है|

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बिंदुओं `(2,-3) ` तथा (4,2) से होकर जाने वाली रेखा की प्रवणता
` " " m_ 1 (2+3)/( 4-2) =(5)/(2) `
माना अभीष्ट रेखा की प्रवणता `m_2 ` है|
तब प्रश्नानुसार ` " " (5)/(2) xxm_ 2 =-1 rArrm_2 =(-2)/( 5) `
तथा ` " " c=4`
`therefore ` अभीष्ट रेखा का समीरकण ` " " y= m_2 x+ c`
`rArr " " y=(-2)/( 5)x+ 4rArr " "2x + 5y -20 =0`

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