whats the values of f(4)=-15 and f(8)=57

Answer 1

(4,, -15) and (8, 57) have a line through them with slope =

(57+15)/(8-4) = 72/4 = 18 = (y+15)/(x-4)

y + 15 = 18x - 72

y = 18x - 87 is the equation of the line where f(4) = -15 and f(8) = 57

slope = 18, y intercept = -87