Question

Dominic is going to drive from his house to City A without stopping. Dominic's house is 300 miles from City A and he plans to drive at a speed of 50 miles per hour. Write an equation for D,D, in terms of t,t, representing Dominic's distance from City A tt hours after leaving his house.

Answer 1

D = -50t + 300

Step-by-step explanation:

Since Dominic lives 300 miles from City A, when he starts his trip (at time

t=0), his distance from City A must be 300 miles, meaning D=300 when

t=0, which is the y−intercept.

(0,300) is a point on the graph

Since Dominic will drive 50 miles per hour, the Dominic's distance from City A decrease 50 miles for each hour of driving, making the slope of D equal to −50.

Slope = −50