Question:

First order Ordinary Differential equation?

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Which of these is seperable?

(1/y)(dy/dx)=(2+x)y

or

(1/y)(dy/dx)=2y+x

also, for the seperable one, what is the general solution and what is the particular solution for y=1, x=0

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  1. (1/y)(dy/dx)=(2+x)y

    (1/y²)dy=(2+x)dx

    ∫(1/y²)dy=∫(2+x)dx

    -1/y+C1=2x+(1/2)x²+C2

    -1/y=2x+(1/2)x²+C2-C1

    let C2-C1=C

    -1/y=2x+(1/2)x²+C

    y=-1/(2x+(1/2)x²+C)

    1=-1/(2*0+(1/2)*0²+C)

    1=-1/C

    C=-1

    General solution: y=-1/(2x+(1/2)x²+C)

    Particular solution: y=-1/(2x+(1/2)x²-1)

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