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3 years ago

5

PLEASE HELP!!!

2 answers:

iragen [17]3 years ago

7 0

Y is usage so set y to 0 and solve for x

y = -10x+100

0 = -10x +100
subtract 100 from each side:
-100 = -10x

divide both sides by -10

x = -100 / -10

x = 10 hours

garri49 [273]3 years ago

4 0

Using the equation <span>-10x + 100, then the answer has to be 10 hours.

This is because -10 times 10= -100 and -100+100= 0

By the time he uses his phone for 10 hours the battery level will be at 0%.

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