Use (Shift + Click&Drag) to pan window.[br]Use (Shift + Scroll) to zoom.[br]Drag the sliders to change values.[br]Once a slider is selected, you can use the arrows on a keyboard to move the value small amounts.[br][br]Want to reset? check the top right hand corner.[br]Once you have had a play, take a challenge.[br] - See if you can find a graph that fits the points for a specific challenge.