Please solve following question

E} The following system of equations (AX = B) is given: u- 1: It. :2 + 21:a ="8 ' 251 + 212 3x3 + 4x, = 9 -3x2 + 2:4:4 = 2 21, +3:2 x3 4x, = 15 a. Calculate the determinant of the matrix A of this system, you do not need to solve the system; b. What does it mean if the determinant of a system has a value? c. What does it mean if the determinant of a system is zero