Unit 2 Test Review (Expressions & Equations)

Front

What is an expression in mathematics?

Back

An expression is a combination of numbers, variables, and operators (such as +, -, *, /) that represents a value.

Front

What is an equation?

Back

An equation is a mathematical statement that asserts the equality of two expressions, typically containing an equal sign (=).

Front

How do you solve for a variable in an equation?

Back

To solve for a variable, isolate the variable on one side of the equation using inverse operations.

Front

What does it mean to evaluate an expression?

Back

Evaluating an expression means to calculate its value by substituting numbers for the variables.

Front

What is a linear equation?

Back

A linear equation is an equation of the first degree, meaning it has no exponents greater than one and graphs as a straight line.

Front

What is the formula for calculating total cost when there is a fixed fee and a variable cost?

Back

Total Cost = Fixed Fee + (Variable Cost per Unit * Number of Units).

Front

If a taxi charges a base fare plus a per-mile charge, how can you express the total fare?

Back

Total Fare = Base Fare + (Per Mile Charge * Number of Miles).

Front

How do you set up an equation from a word problem?

Back

Identify the quantities involved, define variables for unknowns, and translate the relationships into an equation.

Front

What is the importance of checking your solution in an equation?

Back

Checking your solution ensures that it satisfies the original equation and confirms its correctness.

Front

What is a variable in mathematics?

Back

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