solve this question using MATLAB ASAP.

I only need help with problem 11, ignore the rest.

In each of Problems 9 through 12, solve the given initial value problem and determine how the interval in which the solution exists depends on the initial value yo. 9. y'= -4t/y, y(0) = yo 10. y'= 2ty, y(0) = yo 11. y' + y = 0, y(0) = yo