In a certain region, the equation yˆ=19.485x+86.912 models the amount of a homeowner’s water bill, in dollars, where x is the number of residents in the home.

what does the slope of the equation represent in context of the situation?

the water bill increases by about $87 every month.
the water bill increases by about $87 for every additional resident in the home. the water bill increases by about $19 for every additional resident in the home. the water bill increases by about $19 every month.