Posted by Loren on Wednesday, May 25, 2011 at 12:45pm.
Which of the following functions has an inverse that is not a function?
y=x
y=2x+1
y=x to the second power

algebra  MathMate, Thursday, May 26, 2011 at 8:16am
Hint: Use the horizontal test:
If you draw a horizontal line through the function, and it is possible to intersect the function at more than one point, then the inverse is not a function.