Step-by-step explanation:
it is negative so the slope must go downwards from left to right. since it is 1/3, for every 3 to the right, you go one down.
6+7+8
6+8+7
7+6+8
7+8+6
8+7+6
8+6+7
2-(-x+5)
2+x-5
x-3
I decided to included the steps just in case you needed them
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Answer:
((3+5)/2,(6+11)/2)=(4,8.5)