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 represent a total cost in an equation?

Back

Total cost can be represented as a fixed charge plus a variable charge multiplied by the number of units, e.g., Total Cost = Fixed Charge + (Variable Charge * Number of Units).

Front

What does 'solving for x' mean?

Back

Solving for x means finding the value of the variable x that makes the equation true.

Front

What is the first step in solving a linear equation?

Back

The first step is to isolate the variable on one side of the equation.

Front

How do you check if your solution to an equation is correct?

Back

You can check your solution by substituting the value back into the original equation to see if both sides are equal.

Front

What is a variable in an equation?

Back

A variable is a symbol (often x, y, or z) that represents an unknown value in an equation.

Front

What does it mean to 'combine like terms'?

Back

Combining like terms means to simplify an expression by adding or subtracting terms that have the same variable raised to the same power.

Front

What is the purpose of using parentheses in an expression?

Back

Parentheses are used to indicate which operations should be performed first in an expression.

Front

How do you write an equation from a word problem?

Back

Identify the quantities involved, assign variables, and translate the relationships and operations described in the problem into mathematical symbols.