Question

modeling payroll - related problems using linear functions
paxton has a cell phone plan with a fixed monthly charge of $40. additionally, paxton pays $10 for every extra gigabyte of data used beyond the included data limit.
which equation represents paxtons monthly phone bill based on the extra gigabyte of data used?
$y = 10x + 40$
$y = 15x + 40$
$y = 10x + 50$
$y = 15x + 50$

Explanation:

Step1: Identify fixed and variable costs

Fixed cost is $40, variable cost is $10 per extra - gigabyte ($x$).

Step2: Write linear - function formula

The linear - function for total cost $y$ is $y = 10x+40$.

Answer:

$y = 10x + 40$