Question 1: Use Gauss-Jordan elimination to solve the system of linear equations x1 + 3x2 2x3 4. 2x + 3x2 + 3x 1 3 1 2x. 6x3 = 7. Questlon 2: Consider the system of linear equations x1+(a+1)x2+(a+2)x3=l (a+2)x2(a+5)x3=bl (a2)x3=2b +1 where a and b are constant. Find all the value(s) of a and b, if any, such that this system has (a) a unique solution. (b) infinitely many solutions. ((3) no solution