Answer:
[tex]x\geq -4[/tex]
Step-by-step explanation:
[tex]3x-9\geq-21[/tex]
add 9 to both sides
[tex]3x-9+9\geq -21+9[/tex]
[tex]3x\geq -12[/tex]
divide both sides by 3
[tex]\frac{3}{3}x \geq \frac{-12}{3}[/tex]
[tex]x\geq -4[/tex]
Plot a solid dot on -4 on the number line because the inequality sign is great than or equal to and x the great than or equal to -4.
The arrow is then pointed to the left >>>>
