exam Maths Puzzle Numerical Ability

Perform the indicated operation.

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

This is also a fraction. Would this be Undefined because the bottom number = 0?

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exam Other Question

can someone PLEASE help me solve this system:
{ x+ y-4z=6
{2x-5y+3z=2
{ x-6y+7z=-4
thank you so much!
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