diff-equation

Question: If ${y}'=\frac{x-y}{x+y}$, then its solution is



1) ${{y}^{2}}+2xy-{{x}^{2}}=c$
2) ${{y}^{2}}+2xy+{{x}^{2}}=c$
3) ${{y}^{2}}-2xy-{{x}^{2}}=c$
4) ${{y}^{2}}-2xy+{{x}^{2}}=c$
Solution: Explanation: No Explanation
Homogeneous differential equations

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