exam Maths Puzzle Numerical Ability

Solve the system by addition.
x + y = 9
x - y = 9

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exam Other Question

"Explain in your own words(at least 50 words) why the line x = 4 is a
vertical line?"

I think i know the answer i just have a hard time explaining this can you help me? I HOPE U CAN HELP ME WITH THIS....SOLVE THE EQUATION AND INEQUALITIES. WRITE THE SOLUTION TO THE INEQUALITIES IN INTERVAL NOTATION. THANK U.

A) 2|3-P|-4=2

B) 2|3-P|-4<2