Solve the homogeneous systemx? +x3 +x4=0x? +x3=0x3+x4=0by transforming the coefficient matrix (whose columns follow the order: x?, x2, x3, x4) to r.r.e.f (otherwise, you may obtain a wrong answer).Hint: Use the following free variables in order, if needed, t, s, w.Answer: Don't leave spaces between symbols, letters, and numbers.