2025 DHS Promo Q3

2025 DHS Promo Q3

Junior College 1
6 marks
  1. By using the substitution \(y=2z-x\), solve the differential equation \(\frac{3}{x}\left(\frac{dy}{dx}+1\right)=2(1-y-x),\) leaving your answer in the form \(y=\mathrm{f}(x)\).[4]
  2. Hence, find the particular solution of the differential equation in part (a) which passes through the point \((0,2)\).[2]

Solution:

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Answer:(a) (y=1-x-Be^{-x^2/3}) (b) (y=1-x+e^{-x^2/3})

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