(1 point) Consider the following second order linear differential equation: y" + 16y=0 21 Y a Write this as a system of first order differential equations using the substitution st) 22 ds dt b. Find a set of fundamental solutions to the above system by finding the eigenvectors and eigenvalues of the above matrix. Si(t) = A 8 sz(t) c. Use the fundamental solutions šį and Są to write set of fundamental solutions for the original second order DE. yı(t) yz(t)