A group of adults aged 20 to 80 were tested to see how far away they could first hear an ambulance coming towards them. An equation describing the relationship between distance (in feet) and age was found to be:
· Distance = 600 - 3 × Age
How much does the estimated distance change when age is increased by 1?
A) It goes down by 1 foot.
B) It goes down by 3 feet.
C) It goes up by 1 foot.
D) It goes up by 3 feet.
Feedback: The slope gives the increase (or decrease) in the response as X increases by 1 unit. So if Age (x) increases by 1 year, then distance (y) decreases, since slope is negative by 3 feet.