Agroup of students went on a hike and measured the change in elevation over the length of the trail. they plotted these data on the graph shown below. they wanted a shorthand way to describe the line that represents the trail. which slope-intercept equation describes the line? y - intercept = (0,2) slope = -1 a. y = -x + 2 b. y = x - 2 c. y = x + 2 d. y = -x - 2