Answer:
Step 1 should have a -2 substituted for both values.
You would basically go back and trace all your steps, that's what I do. And if your answer seems reasonable then you have the right answer but if your work doesn't match the answer than you've messed up.
I hope I helped if I did like my answer and comment down below thx
Answer:
9y + 4z + 9x
Step-by-step explanation:
4.0 seconds you just said the answer
