Question

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. Yes or No
Identify the error in Brianna's thinking. Determine which of the three expressions are equivalent.

Answer 1

a. and c. are equivalent because the value of each is -4 and x=6

Answer 2

Yes, Brianna's thinking is incorrect because they don't all add up to the same answer. They are totally different equations. even though they all say -4 and x=0 they are different.

Also, I have a question for biology im in middle school do you think you could check it out and try and answer it.
thanks!