Slope from two Ordered Pairs on a Graph      Game L-CRD2b Tips:

- The slope from a point P(-2,5) to a point Q(4,-1) is the (rise)/(run) = ((-1)-(5))/(4-(-2)) = (-6)/(6) = -1.
    If the run = 0, then the vertical slope is said to be undefined.

- Positive slopes rise to the right. Negative slopes rise to the left.

- The slope from a point P(x1,y1) to a point Q(x2,y2) = (change in y)/(change in x) = (y2-y1)/(x2-x1) .

- It may take a minute to load the game at dial-up speeds.
- The game can be played using the mouse by itself or using the keyboard by itself.
- If the game doesn't respond to keyboard input, click inside the game area to reset the game's focus.
- Adjust the game's speed by pressing the + or - key repeatedly.

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