9. 10.

Did you know that solving linear equations like can be traced back to the ancient Babylonians, who were among the first to use algebraic methods? They employed geometric solutions to quadratic equations, which laid the groundwork for modern algebra as we know it!

In real life, mastering linear equations is essential for budgeting and finance, like tracking expenses or calculating profits. When you set an equation to find out how many items you need to sell to break even or how much money to save monthly to reach a goal, you’re using these principles! So, next time you balance your bank account or plan a trip, remember you’re tapping into a vital math skill!