The equation provided is in slope-intercept form, which is given by:

$y = mx + b$

Here:

• $m$ is the slope of the line,
• $b$ is the y-intercept, which represents the point where the line crosses the y-axis.

In the equation $y = 10x - 9$, we can see that:

• $m = 10$ (slope),
• $b = -9$ (y-intercept).

Thus, the y-intercept of the line is $-9$.

Final Answer:

The y-intercept is $-9$.

Would you like further details or an explanation about the slope-intercept form?

Related Questions:

1. What does the slope ($m$) of this equation tell us about the line?
2. How would the line change if the y-intercept were positive instead of negative?
3. How can you find the x-intercept of this line?
4. How does the graph of this equation look (e.g., steep or shallow)?
5. What is the significance of the y-intercept in real-world applications?

Tip:

Remember, in slope-intercept form, you can immediately identify both the slope and the y-intercept without any calculations!