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m1 = - 3/4
krena tgk lurus, maka => m2 = -1 : -3/4 = 4/3
y - y1 = m (x-x1)
y - 2 = 4/3 (x+1)
3y - 6 = 4x + 4
3y - 10 - 4x = 0 atau 3y = 4x + 10 atau 3y - 4x = 10