The average of 5 distinct scores has the same value as the median of the 5 scores. The sum of the 5 scores is
420. What is the sum of the 4 scores that are NOT the median?

You're doing something i dont know how to do but search up on google slope calculator maybe that will get you there

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.