Final answer:
The inequality x + 5 ≥ 9 describes the problem. The solution is x ≥ 4, meaning at least 4 more players need to join.
Step-by-step explanation:
The inequality that describes the problem is x + 5 ≥ 9. This inequality states that the sum of the number of players already joined (5) and the number of additional players needed (x) is greater than or equal to 9, which is the minimum number of players required to form a baseball team.
To solve the inequality, we can subtract 5 from both sides of the inequality: x ≥ 4
The solution to the inequality is x ≥ 4. This means that at least 4 more players need to join the Blue Jays baseball team for them to have enough players to form a team.