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Make the slope a negative reciprocal. That means that you change the sign ( a positive number becomes negative or a negative number becomes a positive ). You also flip the slope as though it were a fraction (4/5 becomes 5/4. And 2/1 becomes 1/2).

So if the slope was 3x it would now be -1/3x.

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13y ago
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Q: How do you write an equation that is purpendicular to another?
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