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y-(-1) = 1/2 (x-0)
y+1 = 1/2 (x-0)
2 (y+1) = 1 (x-0)
2y+2 = x-0
-x+2y = -2-0
-x+2y = -2
dihilangkan negatifnya dengan dibagi -1
jadi x-2y = 2