Yes, the equation $y = 9x + 15$ is a linear equation. It represents a straight line when graphed on the coordinate plane. In this equation:

• $y$ is the dependent variable.
• $x$ is the independent variable.
• The number 9 is the slope of the line, meaning for every 1 unit increase in $x$, $y$ increases by 9 units.
• The number 15 is the y-intercept, meaning the line crosses the y-axis at $y = 15$.

Would you like more details or have any specific questions about this?

Here are 5 related questions:

1. How would you find the x-intercept of the line $y = 9x + 15$?
2. What is the slope-intercept form of a linear equation, and how is it useful?
3. Can you graph the equation $y = 9x + 15$?
4. How would the graph change if the slope or y-intercept were different?
5. How can you find the slope of a line from two points on the graph?

Tip: The slope-intercept form of a line is $y = mx + b$, where $m$ is the slope and $b$ is the y-intercept.