Jawabanmu

2014-03-18T20:31:12+07:00
(x-2)/(1-2) = (y-3)/(4-3)
(x-2)/(-1) = (y-3)/1
x-2 = -y+3
x + y = 5
2014-03-18T20:35:47+07:00
Y-3 / 3-4 = x-2 / 4-3
y-3 / -1 = x-2 / 1
-y-3 = x-2
-3+2-x = y
-1-x = y
m => -1