Persaman garis melalui titik (1,2) dan (3,4) adalah A) 3x+3y=2 c) 2x-2y=2 B) 3x-3y=-2 d) 2x-2y=-2

m = (y2-y1)/(x2-x1) = (4-2)/(3-1) = 2/2 = 1

persamaan garis :
y-y1 = m(x-x1)
y-2 = 1(x-1)
y-2 = x-1
y-x = -1+2
y-x = 1
______ X(-2)
-2y+2x = -2
2x-2y = -2

jawaban : D