By Matthew

Slopes and their equations.

[VERTICAL AND HORIZONTAL SLOPES]

Undefined and Zero slopes are vertical and horizontal, (Zero slopes being horizontal and Undefined slopes being vertical). The equations for said slopes are as follows:

Zero Slope, Any value over 0.

Undefined Slope, Any value under 0.

[POSITIVE AND NEGATIVE SLOPES]

Positive and Negative slopes are the up and down lines. Positive slopes go up, Negative slopes go down. The equation is Rise over Run.

Positive Slope, The slope (4/2) is positive, so the line goes up. As for a positive slope, the rise is 4 and the run is 2.

Negative Slope, The slope (-4/3) is negative, so the line goes down. As for a negative slope, the rise is -4 and the run is 3.

Domain and Range.

Domain is the X values, Range is the Y values. for example (3,1) the Domain is 3, the Range is 1. The X value is always in front of the Y value when doing coordinate pairs.

(5,2) (-2,4) (1,-8) (-3,-5)

Domain and Range also have a play with Functions. As if there is two X values that are the same, ex (3,-5) and (3,6) it is NOT a function. But if there is two Y values that are the same, ex (2,6) and (-5,6) it IS