Solve the following linear inequality and express the solution set in interval notation. Then, graph the solution set on a number line.
3x + 15 < 27

Graph showing the solution set (-∞, 4) for the inequality 3x + 15 < 27.

Graph showing the solution set (-4, ∞) for the inequality 3x + 15 < 27.

Graph showing the solution set (4, ∞) for the inequality 3x + 15 < 27.

Graph showing the solution set (-∞, 4) for the inequality 3x + 15 < 27.