The derivative is basically the slope.
If you are asked to find a derivative of a certain point on the graph, just draw a tangent line to the point, pick 2 points on the tangent line and use the slope formula.
Okay Im REALLY confused with derivatives and how to compute them. THe problem I have is this:
There is a graph in which a straight line crosses -0.25 on the x-axis and 1 on the y-axis. Find f'(1/2).
What do I do?? Please help