Does the table show a proportional relationship? If so, what is the constant of proportionality (unit rate)?

Hours: 2, 3, 4, 5
Miles: 300, 350, 400, 700

Answers:
A. No, the table does not show a proportional relationship
B. Yes, the constant of proportionality is 100
C. Yes, the constant of proportionality is 150

1 answer

To determine if the table shows a proportional relationship, we need to check if the ratio of miles to hours is constant for all pairs of values.

Let's calculate the ratio (miles per hour) for each pair:

  1. For 2 hours: \[ \text{Ratio} = \frac{300 \text{ miles}}{2 \text{ hours}} = 150 \text{ miles per hour} \]

  2. For 3 hours: \[ \text{Ratio} = \frac{350 \text{ miles}}{3 \text{ hours}} \approx 116.67 \text{ miles per hour} \]

  3. For 4 hours: \[ \text{Ratio} = \frac{400 \text{ miles}}{4 \text{ hours}} = 100 \text{ miles per hour} \]

  4. For 5 hours: \[ \text{Ratio} = \frac{700 \text{ miles}}{5 \text{ hours}} = 140 \text{ miles per hour} \]

Since these ratios (150, approximately 116.67, 100, and 140) are not the same, the table does not show a proportional relationship.

The correct answer is: A. No, the table does not show a proportional relationship.