Hey there, Lunablum!
I apologize I'm late.
One scenario could be the amount you exercise.
Lunablum burns y calories if she exercise x hours.
The number of calories you burn depends on the number of hours you work.
( 1, 180 ) ( 2, 360 ) ( 3, 540 )
Assuming you burn 180 calories per hour.
y = 180x
Another scenario could be the amount of money spent on energy bills.
The more Lunablum uses energy the more she will pay.
y being the amount you would pay
x being the time you spent on using electronics
I don't exactly know the amount spent per hour
( 1 ,0.15 ) ( 2, 0.3 ) ( 3, 0.45 )
Assuming you pay $0.15 per hour.
y = 0.15x
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See you soon!