Simplifying Algebraic Expressions

What makes two terms "like terms" in an algebraic expression?

• They have the same coefficients.

• They have the same variables raised to the same powers.

• They are both constant numbers.

• They are separated by a plus sign.

Simplify the expression: 9x + 3x

• 12x^2

• 6x

• 12x

• 27x

Simplify the expression: 8g + 7 + 5g + 2

• 13g + 9

• 13g + 14

• 15g + 9

• 22g

Simplify the expression: 6y² + 2y²

• 8y²

• 4y²

• 12y²

• 6y⁴

Simplify the expression: 7x - 4x

• 11x

• 3x

• -3x

• 7x