Hi

Note:  finding the value of a 3x3 matrix is done as follows:

 = a1(b2c3-c2b3) - b1(a2c3-c2a3) + c1(a2b3-b2a3) 

x+y+z=3

2x -z=7

5y+z=4 



D =  = 13

    1*5 -1*2 +1*10 = 13

 = 39



 = 13



 = -13



   x= 39/13 = 3  y = 13/13 = 1   z =-13/13 = -1 

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