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m1 = -12
titik = (0,-19)
x1 = 0
y1 = -19
rumus : y - y1 = m ( x - x1 )
y - (-19) = -12 ( x - 0 )
y + 19 = -12x + 0
y = -12x + 0 -19
y = -12x -19
12x + y +19 = 0 atau
-12x - y - 19 = 0