1.3 in a number line is between 1 and 2 .
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Between 13 and 14, but closer to 13.
13
13 if you refer to a number line. If you subract you will get -1-12 = -13
13
A perpendicular lines slope is always the negative or opposite reciprocal of a lines slope. Therefore, if your slope is -13/1 then the perpendicularity of the other line is 1/13. The 13 would change positive there fore its its already a negative number then change it posiive.