Question number 39 only

In Problems 39-42, write each system in matrix form. (There is no need to solve the systems). 39. 2x1 + 3x2 - X3 = 0 40. 2x2 - X1 = X3 3x2 + X3= 1 4x1 + X3 = 7x2 X1 - X3 = 2 X2 - X1 = X3 41. 2x1 - X2 = 4 42. X1 - 3x2 + X3 = 1 -x1 + 2x2 = 3 -2x1 + x2-13= 0 3x1 = 4