exam Maths Puzzle Numerical Ability

Solve each of the following systems by graphing. Examples you might want to review (in order) are: Example 3 (p 681), Example 1 (p 679) and Example 4 (pp 681-682).

3x - 6y = 9

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exam Other Question

How would I solve this for kj?:

ln(kj/15) = 2ln(kj/60)

The answer is kj = 240, but I am unsure as to how to get there. Thanks for your help. Can you please help me with these questions?
a) sq. rt. of 12 plus sq.rt. of 108
b) ^3 sq. rt. of 16 times ^3 sq. rt. of 3
Thank you so much for your help.