Beginner
Mathematics
Beginner
Introduction to Algebra: Variables, Expressions & Equations
Algebra is the gateway to advanced mathematics. In this focused lesson, we break down the core building blocks — variables, expressions, and equations — with clear visuals and worked examples. By the end of this video, you will be able to write and simplify basic algebraic expressions and solve one-step equations with confidence.
Key Takeaways
- ✓ A variable is a symbol (usually a letter) that represents an unknown value.
- ✓ An expression combines variables, numbers, and operations without an equals sign.
- ✓ An equation states that two expressions are equal and can be solved.
- ✓ Use inverse operations to isolate the variable when solving equations.
- ✓ Always check your solution by substituting it back into the original equation.
Video Notes
Welcome to Introduction to Algebra. In this lesson we are going to cover the three foundational concepts every algebra student must master: variables, expressions, and equations.
Let's start with variables. A variable is simply a letter that stands in for a number we don't know yet. The most common variable is x, but we can use any letter — y, z, a, b, and so on...
Next, let's talk about expressions. An algebraic expression is a combination of numbers, variables, and mathematical operations. For example: 3x + 5. Notice there is no equals sign — that is what makes it an expression rather than an equation...
Let's start with variables. A variable is simply a letter that stands in for a number we don't know yet. The most common variable is x, but we can use any letter — y, z, a, b, and so on...
Next, let's talk about expressions. An algebraic expression is a combination of numbers, variables, and mathematical operations. For example: 3x + 5. Notice there is no equals sign — that is what makes it an expression rather than an equation...
Keep Watching
