Because the fundamental concept of algebra is the linear equation, a mathematical function that literally any given person probably needs to use every single day.
I have $20, how much gas can I buy?
A apple is $0.50. How much does a dozen apples cost?
I got paid $1000 this week for working 4 shifts, how much will I make next week when I work 5 shifts?
etc. algebra is basically both the most universally important AND foundational form of math that you can honestly say every single person needs to understand in their daily lives.
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