Equation for Scenario

Question

A local dog walker charges a fee of $15 to pick up, then $4 for each dog that needs to be walked. What equation would represent this scenario?

Answer 1

Total cost = Fixed cost + Variable cost

In this problem, you get charge $15 no matter how many dogs you have. So this is the fixed cost.

The $4 is variable, it depends on how many dogs you have. So the total for this would be 4x, where x is the number of dogs.

Cost = 15+4x