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Ex 9.3, 1 Form a differential equation representing the given family of curves by eliminating arbitrary constants 𝑎 and 𝑏. 𝑥/𝑎+𝑦/𝑏=1 Here , we eliminate constants by Differentiating both sides w.r.t.x Now, 𝑥/𝑎+𝑦/𝑏=1 Differentiating Both Sides w.r.t. 𝑥 1/𝑎+1/𝑏.𝑑𝑦/𝑑𝑥=0 1/𝑏.𝑑𝑦/𝑑𝑥=(−1)/( 𝑎) The number of times we differentiate is equal to number of constants 𝒅𝒚/𝒅𝒙=(−𝒃)/( 𝒂) Again Differentiating Both Sides w.r.t. 𝑥 (𝒅^𝟐 𝒚)/(𝒅𝒙^𝟐 )=𝟎 Thus, Differential Equation Is :- 𝒚^′′=𝟎

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Davneet Singh

Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 12 years. He provides courses for Maths and Science at Teachoo.