exam Maths Puzzle Numerical Ability

"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?

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exam Other Question

Solve each system of equaions by using substitution.

x+3y=13
-3+2y=27 Graph the following equations and find the slope of each line:
2x+4y=8
x-2y=6
y=2/3x=2
y=4

Also, finding the slope of the following points:
(6,5) and (3,3)
(4,2) and (1,6)