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Home > CCG > Chapter 2 > Lesson 2.1.4 > Problem 2-42


A first quadrant graph with a line going through (0, comma 0) and (2, comma 1).  And another line going through (0, comma 4) and (2, comma 1).Robert believes the lines graphed at right are perpendicular, but Mario is not convinced. Find the slope of each line, and explain how you know whether or not the lines are perpendicular.  

Remember that if two lines are perpendicular, the product of their slopes is .