**These lines look
pretty different, don't they?**

**Lines
are used to keep track of lots of info -- like how
much money a company makes. Just off the top
of your head, which of the lines above would you
want to describe the profits of YOUR company?
Whether the line is tilted up or down, all of the
sudden, gets REALLY important!**

**I am
now going to introduce you to **

**
Pierre The Mountain Climbing Ant**

**(He's kind of a pathetic
math super hero.)**

**
For slopes, Pierre is going to walk on the lines
from left to right
-- just like we read.**

**
Uphill slopes are
positive slopes.
The slope will be a positive
number like
5
or
2/3.**

**
Downhill slopes are
negative slopes.
The slope will be a negative
number like
-7
or
-1/3.**

**There
are three ways to find the slope of a line.
Two of them are in the next two lessons and the
third comes later.**