**Evaluating expressions**

What is a variable?

Why aren’t we using the multiplication sign

Example: Evaluating an expression

Example: Evaluate a formula using substitution

Evaluating exponential expressions

Evaluating expressions in two variables

Example evaluating expressions in word problems

Expression terms, factors and coefficients

**Writing expressions**

Writing expressions 1

Writing expressions 2

Writing expressions 2 exercise example

Writing expressions 3 exercise example 1

Writing expressions 3 exercise example 2

Writing expressions 3 exercise example 3

**Equivalent expressions**

Combining like terms

Adding like rational terms

Combining like terms 1

Combining like terms 2

Equivalent forms of expressions 1

**Solving equations and inequalities with substitution**

Variables, expressions, and equations

Solving equations and inequalities through substitution example 1

Solving equations and inequalities through substitution example 2

Solving equations and inequalities through substitution example 3

Solving equations and inequalities through substitution example 4

**Thinking about solving equations**

Why we do the same thing to both sides: Simple equations

Representing a relationship with a simple equation

One-step equation intuition

One step equation intuition exercise intro

Adding and subtracting the same thing from both sides

Intuition why we divide both sides

**Super Yoga plans**

Super Yoga plans: Basic variables and equations

Super Yoga plans: Solving one-step equations

**Equations for beginners**

Simple equations of the form ax = b

Example solving x/3 = 14

Example solving x + 5 = 54

Examples of one-step equations like ax = b and x + a = b

**Dependent and independent variables**

Dependent and independent variables exercise example 1

Dependent and independent variables exercise example 2

Dependent and independent variables exercise example 3

**Inequalities**

Inequalities in one variable 1 exercise

Inequalities on a number line