2 answers:
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
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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