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26 February, 09:17

The product of the slopes of two non-vertical perpendicular lines is always - 1. It is NOT possible for two perpendicular lines to both have a positive slope because the product of two positives is positive. So for the product of the slopes to be - 1, one of the slopes must be positive and the other negative.

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  1. 26 February, 13:11
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    I think the answer is true
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