Answer: 500x + 700 > 120000
Explanation:
Let x represent the number of castles he must conquer in order to break the record.
The site awards him 700 points for joining the game and another 500 points for every castle he conquers. This means that if he conquers x castles, the total number of points that he would have is
500x + 700
Greg needs to score more than 120,000 points to beat an online gaming site record. Therefore, the inequality that Greg could use to calculate the number of castles he must conquer in order to break the record is
500x + 700 > 120000