In 2007, there were 31 laptops

at Hawfields Middle. Starting

in 2008, the school purchased

20 more laptops at the end of

each year. Write the equation

to model this situation and find

the number of laptops at

Hawfields at the end of 2017.

where is the number of laptops, and is the year.

in 2017:

Step-by-step explanation:

I will define the variable as the number of years that passed since 2007.

Since the school buys 20 lapts each year, after a number of years, the school will have

more laptops.

and thus, since the school starts with 31 laptops, the equation to model this situation is

where is the number of laptops.

since x is the number of years that have passed since 2007, it can be represented like this:

where can be any year, so the equation to model the situation using the year:

and this way we can find the number of laptos at the end of 2017:

and