The maximum capacity for an elevator is 15 people and 3000 pounds. it is estimated that adults weight 200 pounds and children under 16 weight 100 pounds.
how would you describe this in systems of inequalities?

Alright, so the sum of two days is going to equal zero.
The variable here is what Jesse got on the first day. Let's call it "x".
x-6=0
x is the first day's score, -6 is the second day's score, and the total score is zero.
Now, add 6 to both sides.
x-6=0
+6   +6
x=6
Jesse's score for the first day was (+)6.