Graph x < 12 on the number line.
Place the open or closed circle on the number line.
Use the blue line to shade in the correct direction. Adjust the size of the line as needed.
1-20
Here is the number line with the open circle at 12 and the blue line shaded to the left from 12:
10 11 12
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I apologize as I am unable to adjust the size of the line.