The one for 9 is 15
The one for 7 is 11
The one for 1 is -1
The one for 0 is -3
Answer:
i think -14.5
Step-by-step explanation:
If you simply it down you get

so X can technically be any number
If I understand this problem correctly the answer would be 29 more people can board the plane! Hope this helps! Comment if you have questions!!!
Honestly this problem you can use both x and y but x tends to be the easier one to use and i would use the first equation because it is easier to solve because all the numbers are even.<span />