Answer:
here (edit I made a mistake)
Step-by-step explanation:
9) 
10) y = x - 3
11) 
12) 
these are the slop int forms, my bad...
sorry
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12 people ⇒8 cups
1 person ⇒ 8/12 = 2/3 cup
7 persons ⇒ 2/3 x 7 = 14/3 4 2/3 cups
Answer: She should use 4 2/3 cups of sugar.