Finding Slope from 2 Points (8th Grade Unit 5 Lesson 2.3e)

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We reviewed finding slope from a table and then graphs with grids. Then as we took away the grid lines from the graph, we need to use other means to find the slope of a line.
Eventually, we find that we can use the formula:
slope = (y_2 - y_1) / (x_2 - x_1).