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garis 1
y = 3x + 2 -----> m1 = 3, maka m2 = -1/3
persamaan garis melalui (6,-1) dengan gradien m2 = -1/3
y - y1 = m ( x - x1)
y + 1 = -1/3 (x - 6)-----> kedua ruas dikali 3
3y + 3 = -x + 6
3y + x = 3