The general forms of the equations and a graph each function type are listed below.
b
We can model the cost of an international call y as a function of the length of the call x by using a linear function. Let's recall the general form of a linear function.
y=mx+b
Here, m is the slope and b is the y-intercept of the line. From the graph in Part A, we see that the y-intercept is 0. Let's substitute it into the function.
y=mx+ b ⇔ y=mx+ 0
We can find m by substituting any ordered pair from the given table and simplifying. Let's use (1,0.12).
