Answer:
The answers are correct.
Explanation:
The relationship being proportional means that as one quantity increases, the other quantity also increases. In this case as the number of students increases, the slices of pizza also increase; there is a proportional relationship between the two.
The constant of proportionality refers to the gradient of the graph, which has correctly been found out to be 2. This means that as the number of students increases by 1, the slices of pizza increases by 2.
The last statement is correct as it indicates a point that is on the line, meaning it satisfies the given relationship.