5.5 Parallel Lines

5.5 Parallel Lines   (A) Gradient of parallel lines 1. Two straight lines are  parallel if they have the same gradient. If PQ // RS, then mPQ = mRS     2. If two straight lines have  the same gradient, then   they are parallel.  If mAB = mCD then AB // CD Example 1: Determine whether the two straight lines are parallel. (a) 2y – 4x … Read more