Find the solution to the given 3x3 and 2x2 linear systems using Cramer’s rule.

a. x + y – z = 6 x -3y +7z =13 3x -2y = 4
b. 3x -2y + z = -5 x +y +z =1 6x -4y = 0
c. X +3y -2z = 14 x -2z +3y = 4