Question

Given the data points (1, 4), (2, 9), and (4, 19), which of the following equations describes the best-fit line?
A: y = -1 + 5x
B: y = 5 +1x
C: y = 2 + 5x
D: y = 1 + 5x

Answer 1

(x1,y1) = (1,4)
(x2,y2) = (2,9)
(x3,y3) = (4,19)
slope of the line,m = y2-y1/x2-x1 = y3-y2/x3-x2
point slope form = (y-y1) = m(x-x1)
then make above eq into y = mx+c