Answer:
<h2>6 cups of hot chocolate cost $1.50.</h2>
Step-by-step explanation:
According to the problem, the graph is modeled by the relation

So, we can observe that x-values refer to cups of hot chocolate, and y-values refer to price in dollars.
If we need to find the proce for 6 cups of hot chocolate, we just need to replace
into the given relation, as follows

Therefore, 6 cups of hot chocolate cost $1.50.