write an dequation

Question

 Kiri  charges  $6 per hour to babysit. and one more dollar for additional child The table shows the total hourly fee that Kim charges to babysit. Who charges more per hour?

number of children hourly rate

1 6

2 7

3 8

4 9

write and equation

Answer 1

Hi Rosa,

I will start by showing you how to make an equation for Kiri.

 Kiri charges  $6 per hour to babysit. and one more dollar for additional child.

The $6/hr. will never change, so it is a constant in our equation. We also know that the amount Kiri charges increases for each additional child. Therefore, this is an addition equation. We can start writing it as follows:

$6 +

Now let's add in the cost per additional child. There could be many different numbers of children that Kiri is babysitting. Because that number can change, it must be a variable. Let's use c to represent the number of children. So we can finish the equation:

$6 + $1c = Kiri's charge per hour

Now we need an equation for Kim's hourly babysitting rate. If we look at the table, Kim's rate also increases by $1 every time an additional child is added. So her equation will also include $1c. Kim charges the following:

hourly rate + $1c = Kim's charge per hour

If we use values from the table, we can find Kim's rate. Any pair of children and rate will work.

hourly rate + $1c = Kim's charge per hour

hourly rate + $1x3 = $8

Now you can easily figure out what Kim charges per hour. You can then compare that to what Kiri charges per hour.

I hope this answer was useful! If it helped, please give it an upvote.