exam Maths Puzzle Numerical Ability

Is the following trinomial a perfect square?
x^2+6x+9?

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exam Other Question

Here is one of the hardest problems I have even seen! Can you please see if you can help with this one? I feel like I can write some functions, but I am really confused.
CAN YOU The question I have to ask is i don't know understand these problems, do you think you could help me out here? They are:y=12x-4, y=1/4x+3, 3x-y=6, y=-x+2, y=x-3.