Question Number: 9 Correct: 1 Wrong: 0 dx If x(t) and y(t) are the solutions of the system dy =y and =-x with the initial conditions dt dt x(0)=1 and y(0)=1, then x(7/2)+y(/2) equals Question Number: 10 Correct: 1 Wrong: -0.33 If y=3e +ex-ax is the solution of the initial value problem then d y dx (A) =3 and = 4 +By=4ax, y(0) = 4 and (0)=1, where a, ER, (C) =3 and =-4 (B) =1 and =2 (D) =1 and =-2