Compare the rate of change for the functoin f(x)=x^3-2x^2+x+1

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?

Can someone me out here number 4 plz

Aline passes through 3,7 and 6,9 what equation represents the line