What Is a Variable? Your First Step into Algebra
Before equations and graphs, there is one idea that unlocks all of algebra: the variable. Here is how to think about it clearly.
Hi, I'm Mathew Joane. These lessons break down variables, equations, graphing, and factoring into simple ideas that finally make sense.

Before equations and graphs, there is one idea that unlocks all of algebra: the variable. Here is how to think about it clearly.
Browse every algebra lesson, from first principles to the quadratic formula.
The golden rule of equations: whatever you do to one side, do to the other. Here is a repeatable process you can trust every time.
Why does 2 + 3 × 4 equal 14 and not 20? The order of operations keeps math consistent for everyone, everywhere.
Factoring turns a quadratic into a product of two binomials. Learn the "sum and product" trick that makes it feel almost automatic.
Exponents are just repeated multiplication — but a few simple rules let you combine and simplify them with ease.
The equation y = mx + b holds everything you need to draw a line. Learn what each letter really means on the graph.
When two equations share the same variables, their solution is where the lines meet. Compare graphing, substitution, and elimination.
When factoring fails, the quadratic formula never does. Learn where it comes from and how to apply it confidently.