Google Classroom - Interaktiva lektioner
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Graphing Functions-Section 1.1

Should be able to use just like GeoGebra, but without needing to install it. You can enter functions in the Input line at the bottom of the page. You can zoom in by holding shift key and mouse while hovering at an axis and moving left or right or up or down to change the scale in x or y. The menu icons at the top of the page are also available.