exam Maths Puzzle Numerical Ability

If log3(x+1)-log3(x-1)=2, then x=A/8 where A=

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please show me how to work these problems using the substitution method:

1/2x+1/3y=3
y=3x many likes to buy two different kinds of strings for the guitar . the slinky costs $3.50 for each set and the slippys cost $4.50 for each set. how many of the slippys did he buy if he spent $41 ona total of $10 sets of strings.