Data set warm-up Justin did push-ups every day this week. He did 8 push-ups on Monday, 14 push-ups on Tuesday, 18 push-ups
on Wednesday, 6 push-ups on Thursday, 8 push-ups on Friday, 9 push-ups on Saturday, and 12 push-ups on
Sunday.
What was the maximum number of push-ups that Justin did in a day this week?

X> -2 is the simplified version.

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.