How do you use variation parameters to find a general solution if you are given y_1 and y_2 are linearly independent. Where t>0

<br /> <br />
t^2y''-4ty'+6y=t^{3}+1<br />
y_1 = 5t-1<br />
y_2 = e^{-5t}<br />

<br /> <br />
ty''+(1-2t)y' +(t-1)y = te^t<br />
y_1 = e^t<br />
y_2 = e^{t} ln t<br />

Thanks CB for the LaTex lesson!!!