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Explanation:
The x coordinates are -1 and -5. They add to -6. Which is then cut in half to -3
The y coordinates are -5 and 9. They add to 4. This is cut in half to 2.
The midpoint is therefore (-3, 2)
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A symbolic way to write this is if you had endpoints (a,b) and (c,d), then the midpoint is [tex]\left(\frac{a+c}{2}, \frac{b+d}{2}\right)[/tex]
