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+# Unit 1: Analytical Geometry
+
+- The slope of perpedicular lines are `negative reciprocal`.
+- The slopes of parallel lines are `the same`
+- The slope of a vertical line is `undefined`
+- The slope of a horizontal line is `0`.
+The general equation of a line in standard form is $`ax+by+c=0`$, where $`a,b,c \in \mathbb{Z}, a>0`$ 
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