3- Suppose that x1=-1, x2=2, x3=4, x4=-3 is a solution of a nonhomogeneous syster Ax=b, and that the solution set of the homogeneous system Ax=0 is given by the formulas X1-3r+4s, x2=r-s, X3=r, X4-S a) Find a vector form of the general solution of Ax=0 b) Find a vector form of the general solution of Ax-b