Consider the system of linear equations a1 + 2x2 + 3r3 = 5, T1 + 4x2 + 6r3 = 7, %3D a1 + 6x2 + 8x3 = 9. %3D a) Write the system of linear equations as a matrix equation and hence identify the coef-...

Extracted text: Consider the system of linear equations a1 + 2x2 + 3r3 = 5, T1 + 4x2 + 6r3 = 7, %3D a1 + 6x2 + 8x3 = 9. %3D a) Write the system of linear equations as a matrix equation and hence identify the coef- ficient matrix A, the variable vector x and the constant vector b. b) Solve the system of linear equations by using the Gauss-Jordan elimination method on the augmented matrix [A | b]. c) Solve the system of linear equations by first finding A-(Hint: your answer should be the same as Part b.]