First we have to determine a linear equation. We will take two points (0,900) and (1,850): y=mx+b 900=m*0+b, b=900 850=m*1+900 m=-50 Linear equation is: y=-50x+900 Part A: y-interception is y=900 or(0,900). It means that a car has to travel a distance of 900 miles to reach a final destination. Part B:Average rate of change:=-50. It represents how many miles per one hour changes the distance from a destination. Part C: Domain of this function if the car traveled the same rate until it reached its destination: 0=-50x+900 50x=900 x=900/50=18 Domain: x∈ [0, 18].
