The answer would be b because if you substitute 5 in for x y=2x-6 would equal 4 and y=5x-21 would equal 4. I hope this helps!
10-3=7 3-10=7 if u need help with anything else u can ask
Answer:
Is there more to the question?
Step-by-step explanation:
For this case we must simplify the following expression:

We have that by definition of properties of powers that is fulfilled:

Then, rewriting the expression:

Answer:
