Twelve less than the one fifth of a number is -7

Lindsay used two points, (x,y; ) and (+2.82), to find the equation of the line, y = mx + b, that passes through the points. y2-y, first, she used the definition of slope and determined that the value of mis x, - . given this information, which expression must represent the value of b?

It says factor each expression completely 8y+48

The function f(x) = 14,600(1.1)* represents the population of a town x years after it was established. what was the original population of the town?