It’s important, when working with linear functions, to be able to find the equation of a linear function by reading a graph of the function.
It’s actually a lot easier than it sounds, as long as you remember that all linear functions graph as straight lines that are written as , where is the slope and -intercept (the constant term). Here are instructions for how to do it:
Find the equation of the function from the graph.
You can also find the answer graphically by moving along the -axis one place to the right. You can see that the -value goes from 16 to 12. That means it decreases by . Thus, the slope is .