# How do you determine the slope of the line passing through (-1,0), (1,2)?

##### 1 Answer

The slope of a line between two points is the change in

#### Explanation:

To find the changes in the values, we must pick one ordered pair as the first, and the other is the second. In the end it does not matter which way we do it, as long as we decide which **pair** is first and which is second,

With the ordered pairs (the points) labelled:

#m = (y_2 - y_1)/(x_2 - x_1)#

(Note that, if

The change in a value is the ending value minus the starting value.

**One way**

With

**Another way**

If we choose our first and second points the other way around, it looks like this:

Because **both** signs of the numerator and the denominator changed, the sign of the fraction did not.