exam Maths Puzzle Numerical Ability

how do i solve
5x+2y=4
3x+4y+2z=6
7x+3y+4z=29

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exam Other Question

simplify and reduce to lowest terms or rationalize

1/((sqrt)t-5)+3/((sqrt)t+5)
Please help me find the inverse of:
3 -1
-2 1
All in brackets! If it exists!
Thank you, Ray