Question

A cell phone plan is defined by the function y = 10x + 25, where y is the total monthly cost and x is the gigabytes of data used. After creating a table of values and a graph, what does the initial value of this function represent?
A. The total cost for one month.
B. The number of gigabytes used.
C. The cost for each gigabyte.
D. The fixed monthly base fee.
The fixed monthly base fee.

Answer 1

Correct — D.

The initial value is the y-intercept (when x = 0), so y = 25 is the cost with 0 GB used — the fixed monthly base fee. The 10 is the cost per gigabyte (slope).