Why “ax +0.y + b = 0” is considered as Linear Equation in Two Variables? ๐ค
You're right; the equation `ax + 0y + b = 0` doesn't strictly relate two variables in the same way that equations like `2x + y = 3` or `x - y + 5 = 0` do. While technically it falls under the general form of a linear equation in two variables (`ax + by + c = 0`), there's an important distinction to understand:
**Linear Equations vs. Degenerate Cases:**
1. **Linear Equations:**
- A true linear equation in two variables represents a **non-vertical, non-horizontal line** on a coordinate plane.
- In such equations, both `x` and `y` have **coefficients that are not zero**. These coefficients determine the **slope and y-intercept** of the line the equation represents.
- Changing the values of `x` and `y` in the equation results in different corresponding values for the other variable, maintaining the relationship represented by the line.
2. **Degenerate Cases:**
- Equations like `ax + 0y + b = 0` (where `a ≠ 0`) and `0x + by + c = 0` (where `b ≠ 0`) are considered **degenerate cases** of linear equations.
- These cases represent **special situations** that don't truly depict the relationship between two variables in the same way as standard linear equations.
**Why they're included:**
- Despite not strictly fulfilling the role of relating two variables in the usual sense, these degenerate cases are still considered within the category of linear equations in two variables for a few reasons:
- They can be **obtained from manipulating standard linear equations** through algebraic operations (e.g., multiplying both sides by a constant).
- They can be **helpful in understanding** and solving certain types of problems, such as systems of linear equations where one or both equations may represent a horizontal or vertical line.
- Including them maintains a **broader scope** within the definition of linear equations in two variables.
**In essence:**
While `ax + 0y + b = 0` technically falls under the umbrella of linear equations in two variables due to its form, it's crucial to recognize that it **doesn't represent a true relationship between two variables** in the same way as standard linear equations do. It's a **degenerate case** that arises in specific situations and has its own unique characteristics.
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