Hi, can anyone help me with this question?

Let S be the subspace ofRgiven by the solution set of the equations^{4 }

x_{2}- 3 x_{3}= -x_{2}- x_{3}- x_{4}and x_{1}= x_{1}+ x_{3}= x_{1}- 2 x_{4 Find An example of a matrix for which S is the nullspace }