exam Maths Puzzle Numerical Ability

Solve the following:

3x-5y+2z=19
5x+2y-3z=-8
-2x+3y+5z=7

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exam Other Question

A is 20 years older than B. He is also 6 times as old as B. find their ages. The question in my homework is:
Write the answer using positive exponents only
[2x5y^-4/3y^-2]^2

I know I need to flip to make them positive but have been wracking my brain trying to figure out where to go from there