Advanced Graphing "Go To"

[swisscow]

Hi all

Could someone explain how the "Go To" works in advanced graphing - plot view. For example, if I have V1: y=2x+1, the plot is a straight line as expected. Then if I choose "go to", boxes to put in X and Y come up. Am I supposed to choose one, or type them both in so that the values are on the line (e.g. x=1, y=5)? I'm hoping that it's like the Casio in which one can type in the y-value and then it jumps to the x-value but I really don't know what's going on.

Many thanks