Question

the vet charges $45 for an office visit and $10 for each vaccination your dog needs. write an eaquation

Answer 1

45+10x = y

Explanation:

$45 -- stays the same no matter what so that's constant.

$10 -- this varies dependent on the number of vaccinations your dog needs, so you'd use a variable to represent the number of vaccinations (in this case I'm using variable "x").

So, for example if your dog needed 7 vaccinations, it would be: 45+10(7) = y -- answer being $115.