Question

A gas station Ellis a coffee mug filled with coffee for 3$.for each refill using the same mug the gas station charges 1.25$ for the coffee.if y represents the total cost and x represents the total cost and x represents the total number of filled coffee mugs punched which function rule describes this pattern?

Answer 1

total cost=variable cost+fixed cost
variable cost=1.25 times x or 1.25x
fixed cost=3
y=1.25x+3

f(x)=1.25x+3 is da rule