Answer:
9
Step-by-step explanation:
The coefficient is the number directly next to the variable, in this case, the variable being y, and the number being 9.
In the question:
9y + 5,
9 is the coefficient
y is the variable
5 is a constant (does not change).
Note that the coefficient and constant cannot change, but the value of the variable (y) can vary (hence the name).
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