William recorded data to determine the relationship between the time usage, x, and the percentage of charge left on his mobile phone, y. He graphed the data and drew the line of best fit. The equation of the line of best fit is y = -10x + 100. About how many hours will it take for the phone lose its charge completely?

SOLUTIONGIVENWilliam recorded data to determine the relationship between the time usage, x, and the percentage of charge left on his mobile phone, y. He graphed the data and drew the line of best fit. The equation of the line of best fit is y = -10x + 100.

TODETERMINEThe number hours will it take for the phone lose its charge completely

EVALUATIONHere it is given that William recorded data to determine the relationship between the time usage, x, and the percentage of charge left on his mobile phone, y.

He graphed the data and drew the line of best fit. The equation of the line of best fit is y = -10x + 100.

Now we have to find the number hours will it take for the phone lose its charge completely

Accordingly we get y = 0

[tex] \sf{ \implies \: \: – 10x + 100 = 0}[/tex]

[tex] \sf{ \implies \: \: 10x = 100 }[/tex]

[tex] \sf{ \implies \: \: x = 10 }[/tex]

FINALANSWERIt will take

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