Solve the following problems using the formula: slope = m = rise over run rise run = (y sub one minus y sub two) over (x sub 1 minus x sub 2) y₁ − y₂ x₁ − x₂

1.  Find the slope of the line passing through A(-1, -1) and B(2, 2).
   
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   m = 1
   
2. Show that the coordinates W(2,4), U(-1,-2), and V(1,2) are all on the same line by finding the slope of each pair.
   
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   WUslope = 2
   UVslope = 2
   WVslope = 2  
   Since they all have the same slope, they must be on the same line.

   
   
3. Given the points D (-2, 4) and E (3, 3), determine the slope of the line that contains them.
   
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   -0.2 or - one-fifth 1 5
   

So, now that you can use the formula for slope, would you rather used the formula or plot the points on a coordinate plane to find the slope?

Most of you probably said, "Plot the points," and that is fine. Iit is a sure, safe way to find the slope; however, sometimes the numbers are difficult.

For instance,
(-3.7, 22.62) and (-0.334, -6.29). 

It would be a challenge to plot those accurately, but rather a simple process to use the formula. 

So, now that we have the tools of the formula and the right triangle graph for finding slope, let’s see what it looks like in a table.

Source: Beautiful tools, geishaboy500, Flickr