Answer:
A
Explanation:
The equation is E = 3900 - 80t where E is Terry's elevation and t is the number of seconds after Terry started skiing down.
Because of this, we can say that the slope is Terry's change in elevation per second. If Terry started skiing down, after 2 seconds the equation would look like E = 3900 - 80(2), which would equal 3740. This shows that after 2 seconds of skiing, Terry went a total of 160 feet down the hill, which would be 80 feet every second, which is the slope.
We can also say that the y-intercept, 3900, is Terry's starting elevation. We know this because if we plug in 0 for t, which means that Terry hasn't started skiing yet, we would get 3900.