Each time she goes down, she lowers by 15 meters. The integer is 15 and the integer that represents the elevation is x since it isn't explained, and you'd never know the value. I hope this helps.
15x because the air ballon drops 15 meters each time the elevation decreases
Step-by-step explanation: Im not sure if this is what youre looking for but it drops 15 meters each time, 5 times so the change would be 15x and the x is used as how mant different times the elevation drops
