Which of the following are functions I x y2 II y 2x 1 a I

Which of the following are functions? I. x = y^2 II y = |2x - 1| a) I only b) II only c) both are functions d) neither is a function.

Solution

I.

For any x we have a two y so that x=y^2

y=sqrt{x},-sqrt{x}

So, I is not a function

II.

Given x

There is a unique, y=|2x-1|

HEnce,

b) II only