exam Maths Puzzle Numerical Ability

Could someone please help me with the following problem:

Solve using matrices:

x + 2y -z =2
2x -2y + z =-1
6x +4y =3Z = 5

Thank You
RF

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exam Other Question
Perform the indicated operation.

19-17
_________
(6)(6)-36

This is also a fraction. Would this be Undefined because the bottom number = 0? a person buys stock in cisco at 20.00 a share and stock in nokia at 17.00 a share. the total cost was $5460.00. A month later the values were Cisco at 22.50 a share and nokia at 1