Question

Jessica is selling books during the summer, can someone help out

Answer 1

Option B is the answer - For each additional door she knocks on, her earnings increase by $7.

Explanation:

The linear equation is given as :

`E(x)=7x-25`

Now we will check the equation by putting values of x in it.

Say if Jessica knocks 10 doors ,

`E(10)=7(10)-25` = $45

If she knocks 11 doors ,

`E(11)=7(11)-25` = $52

If she knocks 12 doors ,

`E(12)=7(12)-25` = $ 59

Rate of change is
`59-52=7`

`52-45=7`

We can see that, there is a constant increase of $7 with each increased door she knocks.

Therefore, option B is the answer.