To determine the slope of the line shown in the graph, we can use the slope formula:

$\text{slope} = \frac{\Delta y}{\Delta x} = \frac{y_2 - y_1}{x_2 - x_1}$

From the graph, we can pick two clear points that the line passes through. Let's choose the points $(-10, -8)$ and $(10, 8)$.

Now, apply the slope formula:

$\text{slope} = \frac{8 - (-8)}{10 - (-10)} = \frac{8 + 8}{10 + 10} = \frac{16}{20} = \frac{4}{5}$

Thus, the slope is $\frac{4}{5}$.

So, the correct answer is A. The slope is $\frac{4}{5}$.

Would you like more details or further explanations? Here are five related questions you might find helpful:

1. How do you determine if a slope is positive or negative?
2. What is the significance of a slope of zero?
3. How does an undefined slope differ from a slope of zero?
4. Can you find the equation of the line using the slope and one point?
5. How can the slope formula be applied in three-dimensional space?

Tip: When the line moves upward from left to right, the slope is positive, as seen in this example!