The image shows a graph and a prompt asking to find the slope of the given line or state if the slope is undefined.

To calculate the slope of the line (denoted as $m$), we use the slope formula: $m = \frac{y_2 - y_1}{x_2 - x_1}$ where $(x_1, y_1)$ and $(x_2, y_2)$ are two points on the line.

From the graph, we can identify two clear points:

• Point 1: $(-10, -10)$
• Point 2: $(10, 10)$

Now, applying the slope formula: $m = \frac{10 - (-10)}{10 - (-10)} = \frac{10 + 10}{10 + 10} = \frac{20}{20} = 1$

Thus, the slope of the line is $1$. The correct answer is option A: The slope is $1$.

Would you like further details on how to interpret slope or graph lines? Here are some related questions to expand understanding:

1. What does the slope of a line represent in real-world terms?
2. How do you determine if a line has an undefined slope?
3. What is the significance of a slope being positive, negative, zero, or undefined?
4. Can two lines with the same slope be parallel?
5. How do you find the equation of a line given its slope and one point?

Tip: The steeper the line, the larger the absolute value of the slope. If a line is horizontal, the slope is zero, and if it is vertical, the slope is undefined.