Question

The time it takes to charge the battery of a cell phone is directly proportional to the charge of the battery.
The equation, y = 0.21x, is used to approximate the time it takes to charge the battery of a cell phone.
Cell Phone Battery Charge
100
70
60
Bettery Charge (%)
SON
40
BO
20
NON
Time (AM)
Approximate how long it will take the battery to charge to 100%.
4 hours
7 hours
6 hours
5 hours
Please help me

Answer 1

Answer:

4 i believe

Step-by-step explanation:

Im so sorry if this is wrong and for being late

Answer 2

The time taken by the cell phone battery to charge 100% is 5 hours.

What is  a linear equation?

A linear equation is defined as a equation that has either one or two variables without exponents. A linear equation is an algebraic equation in which each term has an exponent of one and the graphing of the equation results in a straight line.

For the given situation,

The equation is y = 0.21x.

The time taken by the cell phone battery to charge to 100%,

⇒ $100\% = 0.21x$

⇒ $100\%=1$

Thus, $1=0.21x$

⇒ $x=\frac{1}{0.21}$

⇒ $x=4.76$ ≈ $5$

Hence we can conclude that the time taken by the cell phone battery to charge 100% is 5 hours.

Learn more about linear equations here

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