The value of
9 is not-3 because
o a. 9² = -3
o b. (-9) ²# -3
o c. (-3)2 = -9
o d. 3² = -9

x/7.50 = 15

x= 7.50 / 15 divide

x = 2

step-by-step explanation:

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.