Parallel Lines and Slope

Directions: Fill in the boxes with the digits 1 through 9 so that the lines through each pair of points are parallel. Use each digit at most once.


What does it mean for lines to be parallel?
How can you compare pairs of points so that the lines going through the pairs of points are parallel?


Here are a couple sets of possible answers.
Line 1: (4, 9) and (3, 2)
Line 2: (6, 8) and (5, 1)

Line M: (2, 4) and (8, 6)
Line N: (1, 3) and (7, 5)

Source: Nanette Johnson

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