Two Simultaneous Linear Equations

This applet allows the user to adjust sliders controlling slope and y-intercept of two linear equations.
EXPLORE Adjust the sliders for m1 and m2. Describe the effects Adjust the sliders for b1 and b2. Describe the effects. What is the steepest slope possible in this app? Explain. Describe the meaning of point A. Adjust the sliders to make the two lines never intersect. Explain your process. How many solutions result? Adjust the sliders to make two horizontal lines. Explain your process. Adjust the sliders to make the lines coincide. Explain your process. How many solutions result?