Describe the error

X+3y<6

1 answer

The expression \(X + 3y < 6\) represents a linear inequality in two variables, \(X\) (or \(x\)) and \(y\). However, the equation appears to contain an error in terms of variable notation.

  1. Variable Naming: Typically, variables are denoted using lower-case letters. So, instead of using uppercase \(X\), it is conventional to use lowercase \(x\). The correct form would be \(x + 3y < 6\).

  2. Interpreting the Inequality: This inequality describes a half-plane in the coordinate system where the sum of \(x\) and three times \(y\) is less than 6.

To analyze the inequality further:

  • You can rewrite the inequality in a more standard form by isolating \(y\): \[ 3y < 6 - x \quad \Rightarrow \quad y < \frac{6 - x}{3} \]

This shows that for any given value of \(x\), \(y\) must be less than the result of \(\frac{6 - x}{3}\).

  1. Graphing: The inequality can be graphed as follows:
    • First, graph the line \(x + 3y = 6\) by finding the intercepts:
      • For \(x = 0\): \(3y = 6 \Rightarrow y = 2\) (y-intercept).
      • For \(y = 0\): \(x = 6\) (x-intercept).
    • Then, shade below the line since it's a "less than" inequality.

In summary, the error lies mainly in the use of a capital letter for the variable, and the context is that it's a linear inequality that can be analyzed and graphed accordingly.