Tentukan persamaan garis dan gradien yang melalui titik-titik berikut! A.(12,8) dan (4,5) B.(-1,5) dan (-3,2)

A. m = y2-y1 / x2-x1
m = 5-8 / 4-12
m = -3/-8
m =3/8
*Pers
y-y1 = m (x-x1)
y-8 = 3/8 (x-12)
y-8 = 3/8.x - 9/2
y -3/8.x = -7/2

B. m = 2-5 / -3-(-1)
m = 3/2

*Pers
y-5 = 3/2 (x+1)
y-5 = 3/2.x + 3/2
y-3/2.x = 13/2