To solve the problem, I'll analyze the image and calculate the slopes of the dotted line and the line of reflection.

Analysis:

1. Dotted Line:

   • The dotted line connects two points on the graph. To find the slope, we need the coordinates of these two points.

2. Line of Reflection:

   • The line of reflection is the line along which the pink and blue triangles are reflected. This line passes through the origin and appears to be diagonal, indicating it might have a slope of 1 or -1.

Steps:

1. Identify the Points:

   • From the image, the dotted line appears to connect a point on the x-axis to a point on the y-axis.
   • The line of reflection is diagonal and seems to pass through the origin.

2. Calculate Slopes:

   • Slope of the Dotted Line:
     • Use the slope formula $m = \frac{y_2 - y_1}{x_2 - x_1}$.
   • Slope of the Line of Reflection:
     • Since it passes through the origin and reflects the triangles symmetrically, it likely has a slope of 1 or -1.

Calculation:

1. Dotted Line:

   • Assume the points are $(x_1, y_1)$ and $(x_2, y_2)$.
   • Calculate using the identified points.

2. Line of Reflection:

   • If the line goes through $(0, 0)$ and has equal x and y coordinates, the slope $m$ is $1$ or $-1$.

Let me now extract the exact coordinates from the image and provide the solution.It seems that text extraction didn't yield usable results, likely because the image is more of a visual problem rather than containing textual information. However, I can describe the method to find the slopes:

For the Dotted Line:

1. Identify the Coordinates:

   • Look at the grid points where the dotted line intersects the axes or grid lines.
   • Note down these points, $(x_1, y_1)$ and $(x_2, y_2)$.

2. Calculate the Slope:

   • Use the formula $m = \frac{y_2 - y_1}{x_2 - x_1}$.

For the Line of Reflection:

1. Visual Identification:

   • The line of reflection seems to pass through the origin (0,0).
   • If the line bisects the angle between the x-axis and y-axis equally, the slope will be $m = 1$ or $m = -1$.

2. Verification:

   • Confirm that the triangles are symmetric around this line.

If you provide the coordinates of the points where the dotted line intersects, I can confirm the exact slope.

Would you like to proceed with more details on the general method, or do you have specific questions? Here are some related questions that might help:

1. How do you find the slope if the line passes through specific points?
2. What does the slope of a line represent in geometrical terms?
3. How do you determine if two lines are parallel or perpendicular?
4. What properties must a line have to be considered a line of reflection?
5. How can symmetry be used to identify reflection lines on a coordinate plane?

Tip: Always verify the points on a graph visually and analytically to ensure accurate slope calculations.