We have that the solution set (By looking at the graph) will be given by:
That, since in the function we can see that the values come from minus infinity and go to the values defined by the expression on the right side of the inequality.
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We follow the inequality as if it were a function, and graph it, that is:
If we plot the line, we would get:
Which is the line given in the problem, and since y is smaller than -3x -2, we will have that the maximum values will be defined by the expression -3x -2. So, our answer will be all the values below that line to the left, and we can see that the values (given y < -3x -2) are infinite and come from - infinite, so the answer is:
And here is the solution in a graph (shaded):