Solve the following inequality and graph the solution set on a number line. \[ 3 x \geq-15 \] What is the solution? \[ \{x \mid \square \text { (Type an inequality.) } \] (Type an inequality.)

Step 1 ：The given inequality is \(3x \geq -15\).

Step 2 ：To solve for \(x\), we need to isolate \(x\) on one side of the inequality. We can do this by dividing both sides of the inequality by \(3\).

Step 3 ：The solution to the inequality \(3x \geq -15\) is \(x \geq -5\). This means that any number greater than or equal to -5 is a solution to the inequality.

Step 4 ：The solution to the inequality is \(\boxed{x \geq -5}\).