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Question
If 'a' is a real number, what is the distance between the Y-axis and the line x = a?
Solution
The line x = a is parallel to the Y-axis passing through (a, 0).
If a > 0, then the line will be the distance of a unit to the right of the Y-axis.
If a < 0, then the line will be the distance of a unit to the left of the Y-axis.
Thus, the distance between the Y-axis and the line x = a is |a| units.
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