I know to find the slope you have to find two points on the graph and then use this formula:

y2-y1 / x2-x1

However in this graph it only shows the X values, not the Y. So how am I supposed to do it?

Also, could someone guide me to how the derivative graph of it would look like as well.

I've attached the picture of the graph.

Thanks in advance to whoever can help me.