exam Maths Puzzle Numerical Ability

Please help me find the inverse of:
3 -1
-2 1
All in brackets! If it exists!
Thank you, Ray

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exam Other Question

how do i solve
5x+2y=4
3x+4y+2z=6
7x+3y+4z=29 Perform the indicated operation. Reduce each answer to lowest terms.
3 - 3__
2y - 2y + 4