Math 9 Chapter 2 Lesson 4: Parallel lines and intersecting lines

Math 9 Chapter 2 Lesson 4: Parallel lines and intersecting lines 1. Summary of theory 1.1. Parallel lines Let d have the equation (y=ax+b(aneq0)) and the line d’ have the equation (y=a’x+b'(a’neq0)). Then d and d’ are parallel if and only if (a=a’) and (bneq b’) Note: if a=a’ and b=b’ then d coincides with …

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