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23. The equation of a line parallel to y-axis is non-zero real number. = a , where a is any?
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23. The equation of a line parallel to y-axis is non-zero real number....
Understanding Lines Parallel to the Y-Axis
When discussing the equation of a line parallel to the y-axis, we focus on vertical lines. A vertical line has a constant x-coordinate, which leads us to its equation.

Equation of the Vertical Line
- A vertical line can be represented as:
**x = a**
where **a** is any non-zero real number.

Characteristics of Vertical Lines
- **Slope**: The slope of a vertical line is undefined because it rises infinitely without running horizontally. This means it does not pass the vertical line test for functions.
- **Graphical Representation**: On a Cartesian plane, a vertical line intersects the x-axis at the point **(a, y)**, where **y** can take any value. Thus, the line extends infinitely in the upward and downward directions.

Parallel to the Y-Axis
- **Definition**: A line is parallel to the y-axis if it maintains the same x-coordinate for all points along the line. Therefore, for any real number **a**, the line **x = a** remains vertical and parallel to the y-axis.
- **Examples**:
- For **a = 3**, the line would be **x = 3**, which passes through points like (3, 0), (3, 1), (3, -1), etc.
- For **a = -2**, the line would be **x = -2**, also extending vertically through all points where x equals -2.

Conclusion
In summary, the equation of a line parallel to the y-axis is defined by the equation **x = a**, where **a** is any non-zero real number, indicating a vertical line that is crucial in understanding geometric and algebraic principles in mathematics.
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23. The equation of a line parallel to y-axis is non-zero real number. = a , where a is any?
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