The following graphs shows the distance Kyle tracked on his bicycle trip and the amount of time it took him to travel that distance. Examine the graph and use it to answer questions 16-18.​

The point a is at –2 and the point b is at 7. marissa would like to divide this line segment in a 4: 3 ratio, and she would like to use the formula x = (x2 – x1) + x1. what values should she substitute into the formula? a = a + b = x1 = x2 =