### Concept (1)

One of the most important things to understand about lines is the slope. Slope is the 'steepness' of the line, also commonly known as rise over run. We can calculate slope by dividing the change in the x-value between two points over the change in the y-value. In order to understand the importance of the definition of slope, one should understand how to interpret graphs and how to write an equation.

### Sample Problems (5)

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Find the slope between (-3,9) and (-6,-5).

###### Problem 1
How to find the slope between two points using the slope formula.

The slope between (3,1) and (x,4) is ½.

Find x.
###### Problem 2
How to find a point given a slope and another point on the line using the slope formula.

Find the slope between:

a) (3,0) and (3,-2)
b) (-1,4) and (3,4)
###### Problem 3
How to find the slope of vertical and horizontal lines.
###### Problem 4
How to use slopes to tell if three points are collinear
###### Problem 5
Everything about slope, from equations to graphical representations and special cases