Let the n-element linear equations Ax =b,where2a1a22a1X1a22a10A=,xX2=b=a22a1xa22a(①)Prove the determiA=(n 1)a"(i)When a is of any value,the system of equations has a unique solution,and thesolution is x1,()When a is of any value,the system of equations has infinitely many solutions andthe general solution is found.