[color=#ff0000][size=200]*[/size][/color]The definition of slope, as a two part rate.[br][br] [math]m=\frac{change}{change}\frac{in}{in}\frac{y}{x}[/math][br][br]very often this can be calculated using mental math....if necessary there is a formula[br][br] [math]m=\frac{y_2-y_1}{x_2-x_1}[/math]