Answer:
Explanation:
Use some points on the graph:
- (0, 0), (2, 60), (4, 120), (8, 240)
The graph is a line passing through the origin, so this is a proportional relationship.
Standard form of such relationship is
- y = kx, where k- coefficient of proportionality
Using one of the coordinate pairs find the value of k
This is indicating the number of baloons filled per hour is 30.