A car is driven at a constant speed, starting at noon. Which of the following could be a graph of the distance the car has traveled as a function of time past noon?

1.a graph of a curve with positive, decreasing slope starting at the origin2.a graph of a curve with negative, increasing(ly less negative) slope3.a graph of a line with positive slope through the origin4.a graph of a concave down curve that starts at the origin, increases and then decreases
5.a graph of a curve with a positive increasing slope starting at the origin6.a graph of a curve with negative, decreasing slope starting on the positive y-axis7.a graph of a horizontal line with positive y-intercept8.a graph of a line with negative slope and positive y-intercept

figure .