Deriving and Evaluating Expressions with One Variable
Learn what a variable is and how to evaluate expressions with one variable, like . Let’s get started! 🚀
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🛎️ Understanding Variables
- A variable is a letter that stands for a number that can change.
- For example, x can represent the number of months passed.
🛎️ Understanding Expressions
- An expression is formed by combining numbers and variables.
- It shows how a value changes and has no equals sign.
🛎️ Forming Expressions
- Example 1: 20 + 5x means start with 20 and add 5 for each x.
- Example 2: 50 − 3y means start with 50 and subtract 3 for each y.
🛎️ Evaluating Expressions
- To evaluate an expression, you replace the variable with a number.
- You then calculate to find the value of the expression.
Practice Questions
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Deriving and evaluating expressions with one variable
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