Final answer:
The equation that has a slope of zero is C) y = 3. This represents a horizontal line where the slope (m) equals zero.
Step-by-step explanation:
The question asks which equation has a slope of zero (m = 0). In the standard form of a linear equation, y = mx + b, m represents the slope of the line. A slope of zero indicates a horizontal line. Let's consider each option:
- A) y = 2x + 0: The slope (m) is 2, which is not zero.
- B) y = 3x: The slope (m) is 3, which is not zero.
- C) y = 3: This is a horizontal line; the slope (m) is 0, which matches the requirement.
- D) x = -1: This is a vertical line, which does not have a defined slope; it is not zero.
Therefore, the equation with a slope of zero is C) y = 3.