exam Maths Puzzle Numerical Ability

I am having trouble solving this equation its so simple but i cant remember please help.

5x-3y=4
y-x=-2

solving by substitution method please show me how to solve I am not getting the answer right.

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exam Other Question
1. Use properties of the logarithms to expand:
log(base 2) (x - 5) / (x^3)

2. Use properties of the logarithms to expand:
ln 2x / Square root x^2 - 1

3. Express as a singl how do you use a calculator to approximate sqrt 3/5 to the nearest hundredth?

Thank you