Brianna's teacher asks her which of these three expressions are equivalent to each other. Expression A: 9x - 3x - 4 Expression B: 12x - 4 Expression C: 5x + x - 4 Brianna says that all three expressions are equivalent because the value of each one is - 4 when x = 0. Brianna's thinking is incorrect. Identify the error in Brianna's thinking. Determine which of the three expressions are equivalent. Explain or show your process in determining which expressions are equivalent in the space provided.

Lian is deciding which of two gyms to join. each gym charges a monthly rate plus a one-time membership fee. lian correctly wrote and solved a system of linear equations by substitution to compare the costs of the memberships. in her work, she substituted an expression for one variable and solved for the other. this resulted in the equation 75 = 75. what can lian conclude? one gym charges $75 per month. each gym charges $75 per month both gyms charge the same monthly rate and the same membership fee. both gyms charge the same monthly rate, but not the same membership fee.