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y2 = -3
x1 = -1
x2 = -4
y + 6 = x + 1
-3+6 -4+1
-3(y+6) = 3(x+1)
-3y - 18 = 3x + 3
-3x - 3y = 21
dibagi tiga
-x - y = 7
x + y = -7 (c)