Answer:
try socratic it should help
If then that means and when you plug in you get .
Hope this helps :)
22.8
Step-by-step explanation:
20, 11
x=first Number
x-9=second number
above two added together=31 or
x+(x-9)=31
2x=40
x=20 first number
20-9=11 second number
20 (first number) + 11 (second number)=31
31=31