Final answer:
To graph the inequality y<12, place an open circle at 12 on the number line and shade left. The interval notation for y<12 is (-∞, 12).
Step-by-step explanation:
To graph the inequality y < 12 on the number line, you would draw a number line, locate the number 12, and put an open circle on it to represent that the value 12 is not included in the solution set. Then you would shade all the numbers to the left of the open circle to indicate all the values of y that are less than 12. In interval notation, the solution set is represented as (-∞, 12), indicating that y can be any number less than 12.