Question

Brianna's teacher asks her if these two expressions 3x + 5 and 4x are equivalent.

Brianna says the expressions are equivalent because the value of each expression is 20 when x = 5.
Is Brianna correct? Explain your thinking.
Enter your response here

Answer 1

Yes, Brianna is correct because when you solve for x you get 5 and when you substitute you get 20.

Explanation:

combine like terms 4x-3x=x

5=x

substitute x with 5

3(5)+5=4(5)

distribute

15+5=20

Answer 2

No, because if x=? then itś, not a true equation, a true equation is when you have infinite solutions, in this case, if the problem is asking for 1 solution then yes, if it's asking for a true statement no.