Expressions & Equations Review

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What is an equation?

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An equation is a mathematical statement that asserts the equality of two expressions, typically containing variables and constants.

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What are like terms in an expression?

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Like terms are terms that have the same variable raised to the same power. They can be combined by adding or subtracting their coefficients.

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How do you solve for a variable in an equation?

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To solve for a variable, isolate the variable on one side of the equation using inverse operations (addition, subtraction, multiplication, division).

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What does it mean to evaluate an expression?

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Evaluating an expression means substituting the values of the variables into the expression and performing the arithmetic operations.

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What is the purpose of combining like terms?

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Combining like terms simplifies an expression, making it easier to work with and understand.

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What is a variable in mathematics?

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A variable is a symbol, often a letter, that represents an unknown value in an equation or expression.

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What is the difference between an equation and an expression?

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An equation contains an equal sign and shows that two expressions are equal, while an expression does not have an equal sign and represents a value.

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How do you write an equation from a word problem?

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Identify the quantities involved, define variables for unknowns, and translate the relationships described in the problem into mathematical expressions.

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What does the term 'evaluate' mean in the context of expressions?

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To evaluate an expression means to calculate its value by substituting the variables with given numbers.

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