hi all, sorry again for the thousands of stupid questions! :P but heres another one...

ok i said for part (a) that the PDE is a hyperbolic type and so has two sets of real characteristics. and that the characteristics are

then for part (b) i used the coordinates:

which leads to the equation:

but then i am stuck... how can i get the 'general solution' from this, i think i am heading in the right direction, but i am not sure.

any help would be greatly appreciated!

thanks

Sarah