Question

ActivityIn this activity, you will create an equation for a function represented by a verbal description.Vicky charged her phone's battery to 100 percent. Then she took the phone off the charger. When her phone is off the charger, it loses 5 percentof its battery life every hour. What function models the percentage of battery life left in terms of the number of hours since Vicky took it off thecharger?

Answer 1

Since the percent lost per hour is constant, this is a linear equation, and the slope-intercept form of a linear equation is:

$y=mx+b$

Where m is the slope and b is the intercept.

In this case, we want to formulate how much percentage is left based on how many hours have passed, so the percent left is dependent upon the time passed. This means that the dependent quantity is the percent of battery life left, and this will be variable y.