Identify the mathematical functions shown in the image.

Functions:

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

Note: The function \( y = \frac{1}{x} \) appears twice.