Ok nice answer…… well done
Answer:
The quantities used by Manuela were correct
Step-by-step explanation:
The question is
Did Manuela use the right quantities?
Let
x -----> the parts of oil
y ----> the parts of vinegar
we know that
The ratio of the parts of oil by the parts of vinegar of recipe is

Determine the relation used by Manuela

Compare with the recipe


Is true, the quantities are proportional
therefore
The quantities used by Manuela were correct
Answer: Division
Parentheses first according to the order of operations, and the next thing you do is divide inside the parentheses.
The integers are -17 and -18
-8x+8 because you simplify the like terms. So all the x’s and all the whole numbers