How to set different fontsize for multiline title with text and latex formula

sol= dsolve('D2y+2*Dy=exp(x)','y(0)=1','Dy(0)=0','x'); line1=[' solution is']; line2=['$' latex(sol) '$']; ezplot(sol,[-2,0]); title({line1,line2} ,'Interpreter','latex','Fontsize',12)