Question

Michelle is on a road trip with her family and forgot her charger. At the start of the trip, her phone was at 100%. They are driving from Dallas to San Antonio which is a 4.5-hour drive. Her phone's battery life can be represented by y = -10x +100, where x is hours driving. What is the range of this situation?

Answer 1

55 ≤ x ≤100

Explanation:

Given the battery life equation: y = -10x +100 where x is hours driving

As we know that the maximum value of y = 100% when x= 0

<=> y ≤100

They are driving from Dallas to San Antonio which is a 4.5-hour drive.

=> x = 4.5 so we substitute x into the equation, we have:

y = -10*4.5 +100

<=> y = -45 + 100 = 55

Hence, the range of this situation is:

55 ≤ x ≤100

Hope it will find you well.