The document discusses finding the equation of a line that represents points equidistant from the lines y=5 and x=-4. It shows a diagram of the two lines on a coordinate plane, with the set of equidistant points forming a line at a 45 degree angle between the two original lines. The equation of the equidistant line is determined to be x + y = 1 based on the slope of -1 and the point (-4,5) where the two original lines intersect.