Question

The lines graphed below show the amounts of water in two tanks as they

were being filed over time.

Which tank shows a proportional relationship between the amount of
water, in gallons, and the time, in minutes?

Answer 1

Tank B

Explanation:

Proportional relationships are relationships between two variables with equivalent ratios. For a proportional relationship, one variable is always a constant value times the other. A line is a proportional relationship if it starts from the origin, but if it does not start from the origin, it is not proportional.

From the two tanks, we can see that tank A have a y intercept whereas tank B starts from the origin. Therefore tank B shows a proportional relationship.