Having the differential equation $$y''+ay'+by=0~,$$if we know that the Wronskian determinant is different from $~0~$, how can we conclude that
$$-c_1~y_1(x_0)+c_2~y_2(x_0)=A$$ and
$$-c_1~y_1'(x_0)+c_2~y_2'(x_0)=B$$
where $~y_1,~y_2~$ solutions of the differential equation $$y''+ay'+by=0~,~~~~~~~~~~~~y(x_0)=A~~~~ \text{and}~~~~ y'(x_0)=B$$