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TRUE or FALSE 1. In the formula m = y2-yi Y2 - y, is called vertical change. x2-x1' 2. Parallel lines have the same slope. 3. Perpendicular lines none of which is vertical have slopes that are negative reciprocal of each other. 4. All relations are functions. 5. The relation {(-1,3),0,4),(6,8),(5,11),(-1,4)} is a function.​