Question

What is vertical symmetry?

Answer 1

because I can choose a vertical line to draw such that when the paper is folder about that line the halves will lay on each other perfectly

Answer 2

okay I got it now thank you :)

Answer 3

when folder:


and ok:)

Answer 4

no function can be symmetric about the x-axis (or any other horizontal line), since anything that is mirrored around an horizontal line will violate the Vertical Line Test.