The following partial differential equation 

\(x \frac{\partial^2 u}{\partial x^2}-2 x^2 y \frac{\partial^2 u}{\partial x \partial y}\) - \(5 y \frac{\partial^2 u}{\partial y^2}+2x\frac{\partial u}{\partial x}-5y\frac{\partial u}{\partial y}=0\)

is

1
elliptic in {(x, y) ∈ ℝ2 : y > 0}  
2
parabolic in {(x, y) ∈ ℝ: x > 0, y > 0} 
3
hyperbolic in {(x, y) ∈ ℝ2 : xy ≠ 0 & x and y both have same sign} 
4
parabolic in {(x, y) ∈ ℝ2 : xy ≠ 0}  
5
Question Not Attempted

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