Question

find the slope of the line between the points (1, -9) and (8, -9).
the slope is m =
m =
undefined.
.
choose whether the line rises left to right, falls left to right, is vertical or is horiztonal.
vertical
falls
rises
horizontal

Explanation:

Step1: Recall slope formula

The slope formula between two points $(x_1,y_1)$ and $(x_2,y_2)$ is $m=\frac{y_2-y_1}{x_2-x_1}$

Step2: Assign values to variables

Let $(x_1,y_1)=(1,-9)$ and $(x_2,y_2)=(8,-9)$. Substitute into the formula:
$m=\frac{-9 - (-9)}{8 - 1}$

Step3: Simplify the expression

$m=\frac{-9+9}{7}=\frac{0}{7}=0$

Step4: Classify the line

A line with slope 0 is horizontal.

Answer:

$m=0$
horizontal