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 ...

The cost of the pencils (C) is directly proportional to the number of pencils (n). When the proportionality sign (∝) is replaced with an equal sign (=), the equation is \(x = k y\). The constant value ...

On the front page of the Dec. 27 Casper Star-Tribune, the lead story is about Wyoming's growing population. There is a huge problem with the info-graphic, however. The bar graph is way out of ...