Answer:
represent the length
represent the width
And for this case we have the following info given:
The length of a rectangle is 9 feet less than twice the width
If we convert this statement to symbols we got:

And that would be the solution for this case.
Explanation:
For this problem let's define some notation first:
represent the length
represent the width
And for this case we have the following info given:
The length of a rectangle is 9 feet less than twice the width
If we convert this statement to symbols we got:

And that would be the solution for this case.