your classmate wants you to check her work. she is working on a math question that asks her to determine the slope of a line given on a graph. you can see that the graph is a line, and that the line is increasing. your classmate says that it’s a positive slope but you are not sure of the explanation. she tells you that she went down 5 units and to the left 3 units to the next point on the line to determine the slope. determine if your classmate is correct and explain why or why not.