Answer:
4: 60x + 12
Step-by-step explanation:
The amount that she earns in a day is fixed, and already known, so no need to make a coefficient with that term. But, we dont know how much phones she would sell in one day, as that is not limited. Hence, making the variable the amount of phone's she sells, multiplied by 60, as she makes $60 per phone that she cells.
y= 60x+12
