Jon ate too many holiday cookies and gained 9 pounds in December. Then he went on a diet and lost 4 pounds in January. Then he lost another 7 pounds in February. Jon wants
to know what the total change in his weight was over these three months. Which of the
following equations matches the situation above?
0-9+4+7
O 9+ (-4) + (-7)
O None of the above.

Ithink the versus years?

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.

The best answer is 2lbs