Learning high school math (Algebra included) is actually good for three reasons.

1. Some students will actually use it (mathematicians, engineers, scientists, programmers, architects, etc.) Granted, this is probably less than 5% of students.
2. It’s part of a liberal education. What will you ever “use” your history, biology, English, or art for? Most students will never directly use any of these. So what are we trying to pull on high school students? We’re trying to liberally educate you, so you can have intelligent conversation with the world around you.
3. It’s fun. Math is a big game. And there’s nothing more satisfying then working on a problem that’s just perfect for you (not too hard, not too easy).