A mechanic charges $55 an hour for an oil change and spends $45 a day on supplies. Which expression represents the amount the mechanic earns in one day?

55x-45=y

Step-by-step explanation:

in terms of algeabra 55 dollars per hour x amount of hours 45 spent so subtract 45; y is the amount per day. The variables can be swapped

add all the numbers and check the ones place.

the answer is 486. as the ones place is more than 4, the estimation will be the next 10 ie, 490