d^2[u]+D[v]=2 and 4u+D[v]=6 D^2[u]+D[v]=2 -4u-D[v]=16 Add and then D^2[u]-4u=-4 u''-4u=-4 Auxiliary equation r^2-4=-4 so (r-2)(r+2)=0 so r= +/-2 uh(t)=c1e^(2t) + c2e^(-2t) up(t)=A cos t + B cos t This is where I am stuck, what do I do next?
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