The graph represents the perimeter, y, in units, for an equilateral triangle with side length of x units. The slope of the line is 3. 2. The amount of money, y, in a cash box after x tickets are purchased for carnival games. The slope of the line is 3. The number of chapters read, y, after x days. The slope of the line is 4. The graph shows the cost in dollars, y, of a muffin delivery and the number of muffins, x, ordered. The slope of the line is 2.