Write the equation which represents y axis.

Options

A. `y = 0`
B. `x = 0`
C. `x = 1`
D. `x + y = 0`

Answer

To write the equation that represents the y-axis, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Cartesian Plane**: The Cartesian plane consists of two axes: the horizontal axis (x-axis) and the vertical axis (y-axis).

2. **Identifying the Y-Axis**: The y-axis is the vertical line where all points have the same x-coordinate.

3. **Determining the Value of X on the Y-Axis**: On the y-axis, the value of x is always 0. This means that no matter what the value of y is, the x-coordinate will always be 0.

4. **Writing the Equation**: Since the x-coordinate is always 0 on the y-axis, we can write the equation that represents the y-axis as:
\[ x = 0 \]

### Final Answer:
The equation that represents the y-axis is:
\[ x = 0 \]