what is the slope of (-4,8) and (6,6)

You have it upside-down Anonymous!  The slope is (y2 - y1)/(x2 - x1), so (6 - 8)/(6 - (-4)) = -2/10 = -1/5.

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$$\frac{\left( 6-\left( -4 \right) \right)}{\left( 6-8 \right)}$$ = -5

 

Explanation:

x₂-x₁/y₂-y₁

Good spotting Alan :)

 

Anon, if you can remember that slope is rise/run then it is easy because only the y values can go up or down!

So the y values MUST be on the top!