A special class of first-order linear equations has the form a(t)y'(t) + b(t)y(t) = f(t), where a(t) and b(t) are given functions of t. Notice that the left side of this equation can be written as the derivative of a product; so the equation has the form a(t)y(t) + a(t)y'(t) = f(t). Therefore, the equation can be solved by integrating both sides with respect to t. Use this idea to solve the following:
8y'(t) + 6y(t) + 5y(t) = f(t)
y(1) = 9
y(t)