Question

Solve:$2y+9\ge 4$

Answer 1

$2y+9\ge 4$

$\Rightarrow 2y+9-9\ge 4-9$

$\Rightarrow 2y\ge -5$

$\Rightarrow y\ge \frac{-5}{2}$

$\therefore y\in [\frac{-5}{2},\infty )$