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m2 = -1
m1
m2 = -1 : 1/4
m2 = -1 x 4/1
m2 = -4
y - y1 = m(x - x1)
y - 5 = -4(x-(-1))
y - 5 = -4(x + 1)
y - 5 = -4x -4
y = -4x -4 + 5
y = -4x +1
bentuk ax + by - c = 0 adalah
4x + y - 1 = 0
maaf kalau kurang tepat!!