exam Maths Puzzle Numerical Ability

Can you give me a detailed explanation why the line x=4 is a vertical line?

Thanks in advance
Sydoni

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exam Other Question

For each of the following, change the general form of the following quadratic equations into transformational form. State the vertex.
a) y=-4x^2-8x+3
b) y=x^2+9 c...
If the sides of a square are decreased by 3cm, the area is decreased by 81cm^2.What were the dimensions of the original square?