부등식

• [1]
  $\begin{aligned} ax + b &> c \end{aligned}$
• [2]
  $\begin{aligned} ax + b &\geq c \end{aligned}$
• [3]
  $\begin{aligned} ax + b &< c \end{aligned}$
• [4]
  $\begin{aligned} ax + b &\leq c \end{aligned}$