Question

Jackie, an oceanographer, used satellite technology to measure the depth of Gull Bay over several years. The bay's depth changed gradually during this time.
This situation can be modeled as a linear relationship. Use the points (3, 382) and (6, 383) to find the answer.

What does the slope of the line tell you about the situation?
A. The bay's depth increased 2 centimeters every year.
B. The bay's depth increased 1 centimeter every 2 year.
C. The bay depth increased 1 centimeter every 3 years.
D. The bay's depth increased 3 centimeters every year.

Answer 1

Slope = (383 − 382) / (6 − 3) = 1/3. That means the bay's depth increased by 1 centimeter every 3 years. Answer: C.