Answer: Option 'D' is correct.
Step-by-step explanation:
Since we have given that
Let the amount of debt Robert has remaining be 'y'.
Amount he paid each week = $67
Let the number of weeks be 'x'.
According to question, we will get
[tex]750-y\geq 67x\\\\-y\geq 67x-750\\\\y\leq -67x+750\\\\y\leq 750-67x[/tex]
Hence, Option 'D' is correct.