If there were only 9 runners on the team last year,
how many female runners are on the team this year?
explain how you found the answer.

There are 21 female runners on the team this year.

Step-by-step explanation:

You know that the following expression represents  the number of female runners on the marathon team this year:

Based on the information given in the exercise, you can identify that "r" represents the number of runners on the marathon team last year.

So, if there were 9 runners on the marathonn team last year, you can identify that:

Then, in order to find the number  of  female runners on the team this year (if there were 9 runners on the team last year), you need to:

1. Substitute that value of "r" into the expression:

2. And finally, evaluate:

Therefore, there are 21 female runners on the team this year.

There are 21 female runners on the team this year.

Step-by-step explanation:

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its a straight line parallel to the time axis