Respuesta :

Answer:

(5,-5)

Step-by-step explanation:

to find this out you would add them together and then divide by two:

(-5)+15= 10
10/2=5

(-18)+8=(-10)
-10/2=5

so your points would be 5,-5. you would add your x values and divide it by two and then your y values and divide them by two
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