How is the slope of a line connected to the position and the direction of the line?[br][br]Use the applet below to find out!

INSTRUCTIONS:[br][br]Move points A and B to change the position and the direction of the line.[br][br]Notice how the slope fraction changes, and think about the following questions:[br][br]1. What part of the graph determines the change in the numerator of the fraction?[br][br]2. What part of the graph determines the change in the denominator of the fraction?[br][br]3. When is the slope negative?[br][br]4. Is the slope ever zero?[br][br][br]