A beach ball has a diameter of 102 cm. How much air will it take to inflate the ball? Round your answer to the nearest whole cubic centimeter.
a
Oь
416,524.14 cm
555,365.52 cm
1,666,096.56 cm
N
Ос
Od
132.651 cm

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.