Graphing Lines and Line Slope

The first screen shows us how to calculate line slope by coordinates of two points using formula
m = (y2 - y1)/(x2 - x1).
The second one explains m and b in the equation y = mx + b
The third screen explains the equation y - y1 = m(x - x1).
Click on the last icon if you have understand everything to start the game.

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