Mateo begins his dive at sea level. He dives down 15 meters, and then rises up 4 meters. He dives again, going down 7 meters. Which equation models Mateo's movements, and uses the commutative property? (–15) + 4 + (–7) = (–7) + (–15) + (–4) (–15) + 4 + (–7) = 7 + 15 + (–4) (–15) + 4 + (–7) = 4 + (–15) + (–7) (–15) + 4 + (–7) = 4 + 15 + 7

Hey mate here is the answerthe correct answer is b may it will you

So the first thing we do is to multiply the top equation by 3. the reason i want to do this is i notice there will be a 6y on both equations and can possibly add/subtract them. so we get 6y = -3x + 27. adding that and the second equation we get 6x = 27-15 which is 12. divide by 6 and we get 2. ∴ x = 2. substituting 2 into the first equation we get 2y = -2 + 9 which is 7. divide by 2 and we get 7/2. ∴ y = 7/2, x = 2.