Identifying partial regression coefficients

Question

Assignment:

Last year’s utility bill (in dollars) for a sample of homes is estimated by the multiple regression equation  300  7x₁ + 13x₂, where x₁ is the number of occupants and x₂ is the number of rooms in the home.

a. Identify the y-intercept and partial regression coefficients.
b. If 3 people live in a 6-room home, what is the estimated bill?

Provide complete and step by step solution for the question and show calculations and use formulas.