exam Maths Puzzle Numerical Ability

subtract 4 1/4 - 1 1/3

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exam Other Question

I need to solve the problem using an augmented matrix. The problem is:
2x-3y+z=5
x+3y+8z=22
3x-y+2z=12

I put it in augmented matrix notation myself:
2 -3 1 5
1 3 8 22 why does a negative # times a negative # = a positve #