What the answer is and how to solve it

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

Ineed to know the answer to this algebra question.

Ireally need subtract and simplify.(-y^2 – 4y - 8) – (-4y^2 – 6y + 3)show your work, ! i will mark you brainliest but you have to show your work.