HELP!! WRITING INEQUALITIES USING A WORD PROBLEM!! A radio station is giving away tickets to a concert. They plan to give away tickets for seats that cost $10 and $20. They want to give away at least 20 tickets. The total cost of all the tickets they give away can be no more than $280. Write the system of two inequalities that represents the possible number of $10 and $20 tickets they can give away.