John went to the Department Store and bought 9 pieces of notebook and 4 pieces of ballpen. If each ballpen costs Php 18, then how much is the notebook if he paid at most Php 500?


Let x – notebook and y – ballpen


What is the linear inequality statement of this problem?


a. 9x + 4y ≥ 500
b. 9x + 4y 500
c. 9x + 4y ≤ 500
d.9x + 4y > 500