How do we know if a graph represents either direct or inverse proportionality? We look for certain features of the graph and perform some test calculations to help us decide. Look at this graph: The ...

To investigate experimentally the extension of a spring and how it is related to the applied force, and recall that the extension of a spring is directly proportional to the force applied, provided ...

Use straight lines to learn about circles. Graphing data can help you discover patterns in nature. This Snack reveals an important ratio found in circles. On your graph paper, plot the points that ...