Write and Evaluate Algebraic Expressions

Evaluate 27 - x when x = 10

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What is a variable in algebra?

• A constant value that does not change.

• A symbol, often a letter, that represents an unknown value.

• A type of equation used to solve problems.

• A method for graphing linear functions.

Evaluate 3x - 7 if x = 6

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What is a constant in an algebraic expression?

• A variable that can change value

• A fixed value that does not change, such as the number 2 in the expression 3x + 2.

• An expression that contains no numbers

• A term that represents a changing quantity

What is an algebraic expression?

• A mathematical phrase that can include numbers, variables, and operation symbols.

• A type of equation that has no variables.

• A numerical value that represents a constant.

• A graphical representation of a function.

Evaluate 4x + 3 if x = 2

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Let x = 4 and y = 2. Evaluate 3x - 4y.

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How do you combine like terms in an expression?

• You combine like terms by multiplying the coefficients of terms with different variables.

• You combine like terms by adding or subtracting the coefficients of terms that have the same variable raised to the same power.

• You combine like terms by dividing the coefficients of terms with the same variable.

• You combine like terms by ignoring the coefficients and only focusing on the variables.

What does it mean to evaluate an expression?

• To calculate its value by substituting variables with numbers.

• To simplify an expression without calculating its value.

• To rewrite an expression in a different form without changing its value.

• To determine the maximum value of an expression.

Evaluate 9y when y = 3

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