How to plot curve y=a*x with changing parameter a?

Is there any function in Matlab, which allows me to plot a curve with some sort of bar, where can I change a parameter a, to (for example) vary the slope? Something similar to the picture I atttached. Any help is appreciated :)

[Nikola]

Simple geogebra plot

Answer 1

[Matt J]

You can create an app that does so, similar to this example:

https://www.mathworks.com/help/matlab/creating_guis/create-a-simple-app-or-gui-using-app-designer.html