9units sorry for not showing work though but glad I can help
Answer:
12$
Step-by-step explanation:
this is a helper

There is one solution to this system of equations. The answer is B.
This is a false statement.
When you are solving using square roots, you need to be aware that answers can be both positive and negative. When we solve this, you see there are two possible answers.
x^2 - 9 = 0
x^2 = 9
x = +/- 3
While 3 is an answer, so is -3. If we square either of those numbers, we get 9, which will satisfy the equation.