Explain what the slope and intercept mean in each situation.

A graph represents the perimeter, , in units, for an equilateral triangle with side length units. The slope of the line is 3 and the -intercept is 0.

The amount of money, , in a cash box after tickets are purchased for carnival games. The slope of the line is and the -intercept is 8.

The number of chapters read, , after days. The slope of the line is and the -intercept is 2.

The graph shows the cost in dollars, , of a muffin delivery and the number of muffins, , ordered. The slope of the line is 2 and the -intercept is 3.