This is a follow up to my previous post. I have a set of equations I need to solve namely: x1''(t) - 3/85 * sin(wt) = -2k1 + k2 x2''(t) = 12/85 * sin(wt)*(k1 - 2k2 + k3) x3''(t) = 12/85 * sin(wt)*(k2 - 2k3 + k4) x4''(t) =12/85 * sin(wt)* (k3 - 2k4 + k5) x5''(t) =12/85 * sin(wt)* (k4 - k5) I tried using the code: eq1 := diff(x1(t), t, t)-(3/85)*sin(w*t) = -2*k1+k2; eq2 := diff(x2(t), t, t) = (12/85)*sin(w*t)*(k1-2*k2+k3); eq3 := diff(x3(t), t, t) = (12/85)*sin(w*t)*(k2-2*k3+k4); eq4 := diff(x4(t), t, t) = (12/85)*sin(w*t)*(k3-2*k4+k5);

I need help solving a set of linear equations in terms of the variables. I have:

x1''(t) - 3/85 * sin(wt) = -2k1 + k2

x2''(t) = k1 - 2k2 + k3

x3''(t) = k2 - 2k3 + k4

x4''(t) = k3 - 2k4 + k5

x5''(t) = k4 - k5

 

I want to solve this system for k1..k5 in terms of x''(t) and sin(wt). How do I do this? I am so lost!