genuity.com/player/
A car enters a tumpike 22 miles north of a town. The car travels north at an average speed of 64 miles per
hour. How far is the car from the town after 4 hours on the tumpike?
Explain how you can use a linear function to solve this problem. Then, solve the problem



Answer :

Let's approach this problem by breaking it down into clear steps: 1. **Understanding the Problem:** A car starts from a point that is already 22 miles north of a town. It travels further north on a turnpike at a constant speed. 2. **Identifying Known Values:** - Initial distance from the town: 22 miles - Car's average speed: 64 miles per hour - Time spent traveling: 4 hours 3. **Using a Linear Function:** To solve this problem, we can use a linear function that represents the distance `D` that the car travels in relation to time `t`. A linear function has the form `D = mt + b`, where: - `D` is the total distance from the town. - `m` is the rate of change or speed of the car (64 miles per hour in this case). - `t` is the time spent traveling (4 hours in this case). - `b` is the initial distance from the town (22 miles in this case). 4. **Setting Up the Function:** For our specific problem, the linear function will be `D = 64t + 22`. 5. **Calculating Distance Travelled:** Now, we can plug in the value of time `t` (4 hours) into the function to calculate the total distance from the town after 4 hours: `D = 64 * 4 + 22` Let's do the math: `D = 256 + 22` `D = 278 miles` 6. **Conclusion:** Therefore, after 4 hours of traveling on the turnpike, the car is 278 miles north of the town.