Progressive Wave Graph

[Vaseline]

Hi I've been told to draw a graph for a progressive wave, using displacement on the y-axis, and distance from source of disturbance on the x-axis.

I have drawn one for displacement against time, but not sure how to do one for this.

I know that all the points on progressive waves have same amplitude and period of oscillation, but phase of oscillations varies as distance from source varies - but I don't really understand this.

 

[Redbelly98]

Do you have an equation for a progressive wave (also known as a traveling wave)? It seems that would be necessary in order to have been asked a question like this ... surely your textbook or lecture notes have the equation.