In algebra, letters are used when numbers are not known. Algebraic terms, such as \(2s\) or \(8y\), leave the multiplication signs out. So rather than \(2 \times s\), write \(2s\), and rather than \(8 ...

Curriki, a global K-12 community for creating, sharing, and finding open learning resources, has launched a free Algebra 1 course aligned with the Common Core State Standards. Available online, this ...

A mathematical proof is a sequence of statements that follow on logically from each other that shows that something is always true. Using letters to stand for numbers means that we can make statements ...

https://doi.org/10.5951/mathteacher.112.6.0432 • https://www.jstor.org/stable/10.5951/mathteacher.112.6.0432 Copy URL ...