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y = mx + c
m = 3
karena tegak lurus, maka
m1 . m2 = -1
3 . m2 = -1
m2 = -1/3
y - b = m(x - a)
y -(-1) = -1/3(x - 6)
y + 1 = -1/3x + 2
y = -1/3x + 2 - 1
y = -1/3x + 1
3y = -x + 3
3y + x = 3