### Slope and lines

Slopeis the measure of the “steepness” of a line. It can rise or fall at a fast rate or a slow, gradual rate. There are a few general things that you need to know about slope.

This line is increasing. Always go from the left to right and think if this were a hill, would you have to walk up it or down it? Up! So, any line that you would have to walk up is increasing and a positive slope.

This would be a hill that you would walk down, right? This line is decreasing and is a negative slope.

Well, you wouldn’t be walking up or down on a hill like this. A horizontal line always has a zero slope because it has no steepness!

You wouldn’t even be able to get onto this hill! It would be impossible! The “math” way of saying something is impossible is undefined. All vertical lines have an undefined slope.

These facts are very helpful, but we want to be able to find the value of the slope also.

$$slope = \frac{{rise}}{{run}}$$       rise is your “up or down” & run is your “left or right”

If they give you a graph, we can simply count from one point to another.

Example 1:

This is a positive slope.

$$slope = \Large \frac{{rise}}{{run}} = \Large \frac{2}{3}$$

The slope of this line is $$\Large \frac{2}{3}$$.

If we aren’t given a picture, we can still find the slope as long as we are given two points. You can always graph the two points and count like we did above, but there is a much quicker way!

$$slope = \Large \frac{{rise}}{{run}} = \Large \frac{{{y_2} - y{}_1}}{{{x_2} - {x_1}}}$$

Example 2:

Find the slope between the points (3, -2) & (5, -7).

$$(3, - 2)(5, - 7)$$

$$({x_1},{y_1})({x_2},{y_2})$$

Then, plug them in.

$$\Large \frac{{{y_2} - y{}_1}}{{{x_2} - {x_1}}} = \Large \frac{{( - 7) - ( - 2)}}{{5 - 3}} = \Large \frac{{ - 5}}{2}$$

The slope between the two points is $$\Large \frac{{ - 5}}{2}$$.

1274 x

Find the slope of each line.

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1329 x

Find the slope of each line.

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1094 x

Find the slope of a line perpendicular to each given line.

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### Geometry

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Constructions
Parallel Lines and the Coordinate Plane
Properties of Triangles

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