exam Maths Puzzle Numerical Ability

Hello, can anyone help me with this?

Solve the following system by graphing.

x + y = 6
x - y = 3

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exam Other Question

I am not able to figure these out. Can someone help me through a couple

1.) log4x+log4y-log4m

2.) ln54-ln6

3.) log(x-2)-log(x-2 I am not sure if you would use the foil method to answer this question or not.
(2x-y)*2. (*2 means squared)
I am confused on this question. I would really appreciate your help. Thanks