Question
Solve the following linear inequations in R: Solve: 4x - 2 < 8, when
  1. $\text{x}\in\text{R}$
  2. $\text{x}\in\text{N}$
  3. $\text{x}\in\text{N}$

Answer

Now, 4x - 2 < 8 ⇒ 4x < 8 + 2 ⇒ 4x < 10 $\Rightarrow\text{x}<\frac{10}{4}=\frac{5}{4}$
  1. If $\text{x}\in\text{R},$ then $\text{x}<\frac{5}{2}\Rightarrow\text{x}\in\Big(-\infty,\frac{5}{2}\Big)$
  2. If $\text{x}\in\text{Z},$ then $\text{x}<\frac{5}{2}\Rightarrow\text{x}\in\{...,-2,-1,0,1,2\}$
  3. If $\text{x}\in\text{N},$ then $\text{x}<\frac{5}{2}\Rightarrow\text{x}\in\{1,2\}$

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