Question

Which expression is equivalent to 7x + 9 - 2x?
Answer choices 14x, 18x, 5x + 9 or 9x + 9

Answer 1

7x + 9 - 2x

We need to combine like terms (meaning terms that have the same power and variables);

(7x - 2x) + (9)

5x + 9

Answer 2

5x+8 because 7x-2x=5x and you cant do anything with the 9 so it just stays as a hang on at the end.

Explanation: