Exploring Parts of an Expression

What is a variable in an equation?

• A part of an expression added together

• A number with no letter

• A letter representing an unknown number

• A number in front of a letter

Which of the following is a constant?

• 5

• x

• 3x

• 2y

In the expression 3x, what is the coefficient?

• None of the above

• 3x

• 3

• x

What are terms in an expression?

• Numbers with no variables

• Letters representing unknowns

• Numbers in front of variables

• Parts of an expression added together

Which of the following are like terms?

• 2x and 3x

• 2x and 2y

• x and x^2

• 5 and x

Identify the terms in the expression 2x + 5 + 3x.

• 2x, 5, 3x

• 2, 5, 3

• 2x, 5x, 3x

• x, 5, x

In the expression 3x + 2y - x + 5, what is the coefficient of the term -x?

• -1

• x

• 1

• 0

What is the constant in the expression 3x + 2y - x + 5?

• 3x

• 5

• 2y

• -x

Which of the following is a common mistake when identifying terms in an expression with subtraction?

• Ignoring the constants

• Adding the terms incorrectly

• Forgetting to include the variable

• Not recognizing the negative sign

What should you remember about coefficients when no number is written in front of a variable?

• It is negative

• It is one

• It is a constant

• It is zero