Below is an applet designed to allow you to investigate how the slope and y-intercept affect the graph of a line. The equation you will be using is y=a*x+b
1) What do you notice about the line as you change the value of a? 2) What do you notice about the line as you change the value of b? 3) What kind of slope give your a flatter line? What about a steeper line? 4) What kind of y intercept will cause the line to move up? Move down? 5) In the equation, which variable is the slope? Which is the y-intercept?