2. Show that, like the wave equation, the given PDE is hyperbolic and find its general solution by introducing the suggested change of variables.
(b) uxx - 4uxy - 5uyy = 0 ........
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Solution. Introduce new variables
Use chain rule, we have
A PDE is shown to be hyperbolic and its general solution is found by introducing a suggested change of variables. The solution is detailed and well presented.