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(y-2)/(-1-2)=(x-3)/(0-3)
(y-2)/-3=(x-3)/-3
-3y+6=-3x+9
-3y=-3x+9-6
-3y=-3x+3
-y=-x+1
y=x-1
jawab: C
3=x , 2=y
2=3-1 , -1=0-1
y=x-1 (c)