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सिद्ध कीजिए की `x(1+lambda ) +y (2-lambda ) +5=0` जहाँ `lambda ` एक स्वेस्छ अचर है, से निरूपित रेखाओं का परिवार एक स्थिर बिंदु से होकर जाता है|वह स्थिर बिंदु भी ज्ञात कीजिए|

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Correct Answer - ` ((-5)/(3), (-5)/(3))`
`x(1+lambda ) +y ( 2-lambda ) +5=0 " "rArr " "( x+ 2y +5 ) +lambda (x-y) =0`
स्पष्टतः (i ) प्रतिच्छेद बिंदु से होकर जाती है|
` " "x+ 2y +5=0 ` तथा ` x-y =0`
हल करने पर ` " " x=- (5)/(3) ,y =-(5)/(3)`

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