exam Maths Puzzle Numerical Ability

PLease help to solve

2x - y - z = -5
-2x + 2y - z = 5
x + 3y + z =6

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exam Other Question

please show how to simplify

1. 16^1/5*64^1/5

2. 7^4/5 over 7^1/3

3. (10^3/4 * 4^3/4)^-4

4. 1 over x^-2/3

5. (xy^4/5)^2/3

I am so lost and help with any of the above problems will be greatly appreciated
LLO Please help.

Plot the graphs of TWO of the following four functions.f(x)=6x
1. f(x)=3x - 2
2. f(x)=(1/2)x
3. f(x)= log2x