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4x - 12 = 6y
4/6 x - 2 = y
2/3 x - 2 = y
maka gradiennya = 2/3
2. 9x + 6y + 12 = 0
6y = - 9x - 12
y = -9/6 x - 2
y = -3/2 x - 2
maka gradiennya = - 3/2