Which number line represents the solution set for the inequality 3x < –9? a number line from negative 4 to 4 in increments of 1. a point is at negative 3 and a bold line starts at negative 3 and is pointing to the left. a number line from negative 4 to 4 in increments of 1. a point is at negative 3 and a bold line starts at negative 3 and is pointing to the right. a number line from negative 4 to 4 in increments of 1. an open circle is at negative 3 and a bold line starts at negative 3 and is pointing to the left. a number line from negative 4 to 4 in increments of 1. an open circle is at negative 3 and a bold line starts at negative 3 and is pointing to the right.