Can you help me find the volume of this cube???

Which of the following system of equation is not equal to the system of equations is not equal to the system of equations shown below

Abby is preparing fruit punch for her party. she starts with a bowl filled with liquid that has 1/2 fruit juice and 1/2 sprite, but she decides it's too fruity. so she pours out 1/4 of the liquid, and then fills the bowl up again with sprite. what fraction of the punch is now sprite?

Whats the name of the vertical axis