Analyze the mathematical expressions shown in the image.

Mathematical Expressions:

• \( y = \frac{1}{x} \)
• \( y = x \)
• \( y = x^2 \)
• \( y = \frac{1}{x} \)
• \( y = 5x \)
• \( y = -2x^2 \)

Note: The image contains some handwritten mathematical equations. These are presented above.