1.

If ‘a’ is a real number, what is the distance between the Y-axis and the line x = a?

Answer»

Equation of Y-axis is x = 0. 

Since, ‘a’ is a real number, there are two possibilities. 

Case I: a > 0 

Case II: a < 0 

∴ Distance between the Y-axis and the line x = a = a-0 = a 

Since, |a| = a, a > 0

= – a, a < 0 

∴ Distance between the Y-axis and the line x = a is |a|



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