By evaluating in y = 0, we will see that the phone will lose its charge completely after 10 hours.
About how many hours will it take for the phone lose its charge completely?
We know that the equation that models this is:
y = -10*x + 100
Where y is the amount of charge left, and x is the number of hours.
The pone will lose all of its charge when y = 0, so we can replace that in the equation above and then solve it for x:
y = 0 = -10*x + 100
10x = 100
x = 100/10 = 10
x = 10
This means that the phone will lose its charge completely after 10 hours.
If you want to learn more about linear equations:
https://brainly.com/question/1884491
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