exam Maths Puzzle Numerical Ability

How can I solve 2/3[ln(x^2-9)-ln(x+3)]+ln(x+y). This is a hard equation for me. Please help!

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exam Other Question
Determine which two equations represent perpendicular lines?

(a) y = 4x – 8
(b) y = 1/4x + 8
(c) y = – 1/4x + 8
(d) y = 1/4x – 8

I am not coming up with any of the sulutions can you please help me out. i need some help solving this equation and if possible expressing my answer as an ordered pair

2x-4y=8
x-2y=4

thank you