Five mark example problem V — task. Mathematics State Board, Class 10.

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A mobile phone is put to use when the battery power is

$100 \%$ .The percent of battery power '

$y$ ' remaining after using the mobile phone for

$x$ hours is assumed as

$y = -0.25x + 1$ .

(i) Draw the graph of the equation.

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(ii) Find the number of hours elapsed if the battery power is

$40 \%$ . hours.

(iii) How much time does it take so that the battery has no power? hours.

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22. Five mark example problem V