Which of the following is not a condition that must be met before you can use the quadratic formula to find the solutions of an equation?
A. There can be no term whose degree is higher than 2.
B. The coefficient of the x2-term cant be zero.
C. One side of the equation must be zero.
D. The coefficient of the x2 -termmust be positive.

Ithink the answer is d.

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.