Algebra Basics
⭐ MasteredIn algebra, letters stand for unknown numbers. If x + 3 = 10 then x = 7. Solving means finding the unknown.
The word algebra comes from an Arabic word meaning reunion of broken parts.
All about Algebra Basics
Algebra uses letters, such as x or n, to stand for unknown numbers. An expression like x + 3 describes a value, and an equation like x + 3 = 10 says two things are equal. Solving the equation means finding the value of the letter that makes it true.
To solve x + 3 = 10, subtract 3 from both sides to get x = 7. Whatever you do to one side of an equation, you must do to the other side to keep it balanced, like a set of scales.
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Real-life uses of Algebra Basics
- Working out the cost of several items when you know the total
- Writing rules for computer games
- Finding out how many days it takes to save for something
Frequently asked questions about Algebra Basics
What is a variable?
A letter that stands for a number that can change or is not yet known.
How do you solve 2x = 12?
Divide both sides by 2, so x = 6.
Why do we need algebra?
Algebra lets us write general rules that work for any number, and it is used in science, engineering and computing.