To find the slope of the line that passes through the points $(-10, -8)$ and $(-9, -8)$, you can use the slope formula:

$m = \frac{y_2 - y_1}{x_2 - x_1}$

For the given points:

• $(x_1, y_1) = (-10, -8)$
• $(x_2, y_2) = (-9, -8)$

Plugging in the values:

$m = \frac{-8 - (-8)}{-9 - (-10)}$

Simplify each part:

1. In the numerator: $-8 - (-8) = -8 + 8 = 0$
2. In the denominator: $-9 - (-10) = -9 + 10 = 1$

This gives:

$m = \frac{0}{1} = 0$

So, the slope of the line is $0$, which means the line is horizontal.

Would you like further details, or do you have any questions?

Here are five related questions you might explore:

1. What is the slope of a vertical line?
2. How do you determine if two points form a horizontal or vertical line?
3. How can you use the slope to determine if two lines are parallel?
4. What is the equation of a line with a slope of zero passing through a specific point?
5. How do you find the slope when given the equation of a line in standard form?

Tip: When the slope calculation results in a zero in the numerator, the line is horizontal, and when the denominator is zero, the slope is undefined (vertical line).