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एक सरल रेखा जिसकी मूलबिंदु से दुरी 1 इकाई है बिंदु (-1 ,2 ) से होकर जाती है इस रेखा का समीकरण ज्ञात कीजिए|

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Correct Answer - ` 3x+ 4y -5=0 `
`y= mx +c" "...(i)`
` therefore ` मूलबिंदु से समीकरण (i ) पर डाले गए लम्ब की लम्बाई `= (mxx0-0+c)/(sqrt(m^(2) +1))`
` rArr" "(c)/(sqrt(1+m^(2)) )=1 " "rArrc^(2) =m^(2) +1 " "...(ii)`
समीकरण (i ),बिंदुओं (-1 ,2 ) से होकर जाती है|
`therefore " " 2=-m+c " "rArr " "c=m+2 " "...(iii)`
अब समीकरण (ii ) व ( iii ) हो हल करेंगे|

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