- #1
tracedinair
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Homework Statement
Solve the following initial value problem,
y' = (x-y)/(x+y), y(1) = 1
Homework Equations
The Attempt at a Solution
dy/dx = (x-y)/(x+y)
dy/dx * (x+y) = x-y
(x+y)dy = (x-y)dx
∫(x+y)dy = ∫(x-y)dx
xy + y^(2)/2 = x^(2)/2 - xy + C
2xy + y^2 = x^2 - 2xy + C
y^2 + 4xy - x^2 = C
Sub in x=1, y=1
1 + 4 - 1 = C = 4
Soln: 2xy + y^2 = x^2 - 2xy + 4