The scenario represents a linear function. The rate is at a constant increase therefore it is linear.
Linear because it’s a constant rate
Since it’s doubled, and doesn’t go at a constant rate, it is a exponential function
Exponential since it increases by a multiplicative rate. It’s not constant
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Thus ;

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Answer:
x+7
Step-by-step explanation:
7/y-?/y=x/y
?=x+7
Sorry, I wish I could elaborate more but I can't...