Question

Nancy is running on a trail that is a 5.3 miles long. After 20 minutes she has ran 1.45 miles. Write an addition equation to find how much farther Nancy has to run to complete the trail.

Answer 1

The first thing we are going to do for this case is to define a variable.
 We have then:
 x: number of minutes
 y: number of miles traveled.
 The equation that models this problem is given by:
 $y = - (1.45 / 20) x + 5.3$
 (-1.45 / 20): is the speed with which Nancy runs
 5.3: is the length of the path.
 Answer:
 an addition equation to find how much farther Nancy has to run to complete the trail is:
 $y = -(1.45/20)x + 5.3$