Try multiplying the first equation by 3, then adding the two equations, as this will eliminate .
I have found the general solution for the equation of to be
by the method of undetermined coefficients.
However I need to use the method of variation of parameters, but I am totally confused.
I have the homogeneous equation as: and so
and
But where do I go now? Can anyone help me with the steps to solve this?
Thank you all in advance.