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Those lines are an algebraic operator that marks an absolute value. If the value surrounded by the lines is negative, it becomes positive. If it's positive, it remains so. For example:
|-9| = 9
|9| = 9
|5 - 7| = 2
|7 - 5| = 2
If f(x) = |x2 - 5|, then f(x) describes a parabolic curve for which the values in the range -5 ≤ x ≤ 5 are positive rather than the expected negative. It would look vaguely similar to a calligraphic letter "w", with the bottom two points being on the x axis.
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What does a number in between two straight lines mean?
It means absolute value, or the distance from zero.
What do you call two perpendicular number lines?
2 perpendicular lines are called 2 pwrpendicular lines it is sorry <:(
The plane formed by the intersection of two number lines?
Origin
What is the difference between vertical and horizontal lines?
vertical lines run from top to bottom, horizontal lines run from left to right the difference between the two is 90 degrees if you place vertical lines next to horizontal lines.
What is formed by two number lines that intersect at a right angle?
a coordinate plane
