How it works ?
1) In the applet below, note the slope displayed.
2) Drag one (or both) of the white points to move the line so that this line has this slope.
3) Click the “Check Your Graph” checkbox to determine if you’re correct. If the slope of your line matches the slope displayed, you’ll see a “CORRECT” sign appear. If your line does not have the slope displayed, you’ll see a “Not Correct” sign appear. If this happens, try again. If you need a refresher,