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Please help me answer the question in the picture

Please help me answer the question in the picture-example-1
User ARMAGEDDON
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Perpendicular = negative and reciprocal slope. The slope now = 3, turn it negative and reciprocal = -1/3
Now use formula: y-y1 = m(x-x1)
Plug in point (4, -1) and new slope
Solution: y+1 = -1/3(x-4)
The answer is C
User Laokoon
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