I am lost with initial condition and what to set D and B equal too.

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- January 10th 2011, 10:09 PMdwsmithu_x-3u_y=0

I am lost with initial condition and what to set D and B equal too. - January 11th 2011, 03:12 AMPaulRS
You may choose any numbers you like for B and D as long as the change of variables is invertible. - because these do not affect your original equation.

Say you could choose and . (Wink) - it looks nice that way.

Once you have undone your change of variables, set to use your initial condition.

Why do you use the and for coefficients? - January 11th 2011, 08:09 AMdwsmith
- January 11th 2011, 11:00 AMdwsmith

How do I incorporate into the general solution - January 11th 2011, 05:18 PMPaulRS
Well, note that then: - from the equation you have there.

Now to get , plug into . - January 11th 2011, 05:59 PMdwsmith
- January 13th 2011, 02:31 PMPaulRS
We want , but to calculate this we let and then