Given a mathematical or real-world statement containing one letter, identify whether the letter represents an unknown value or any value in a stated set and name the stated set when one is provided.
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What you’ll learn
Given a mathematical or real-world statement containing one letter, identify whether the letter represents an unknown value or any value in a stated set and name the stated set when one is provided.
Key idea
A variable is a letter that stands for a number.
Worked example
In this expression, which symbol is the variable?
8x + 5
x
Answer: x
Quick Check
Which choice correctly identifies the variable, coefficient, and constant?