exam Maths Puzzle Numerical Ability

4. Solve
x + y - z = 0
2x - y + z = 6
-x + y + z = 8
Show your answers as (x,y,z)

PLEASE SHOW ALL WORK
THANK YOU

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exam Other Question

The difference between two numbers is 12. If 20 is added to twice the larger number the result is 4 more than 3 times the smaller number. Find the two numbers. There are 132 more silver dollars than 50-cent pieces.
The ratio of the silver dollars to 50-cent pieces is 5:2.
So how many of each coin are there?