Tammy must run more than 79 miles total to reach her fitness goals. She has already run 31 miles and runs 6 miles per day. Which of the following inequalities could be used to solve for x, the number of days Tammy still needs to run to reach her fitness goals?
A.
6x - 31 > 79
B.
6x + 31 > 79
C.
31x > 31
D.
6x > 79