garis y=mx+c melalui titik (1,1) dan (2,3). Tentukan nilai m dan c

persamaan garis melalui 2 titik
(1,1) dan (2,3)

(y-y1) / (y2-y1) = (x-x1) / (x2-x1)
(y-1) / (3-1) = (x-1) / (2-1)
(y-1) / 2 = (x-1) / 1
y-1 = 2(x-1)
y-1 = 2x - 2
y = 2x - 2 + 1
y = 2x -1

m = 2
c = -1