Since x and y represent the number of chairs and tables, we can say x + y <= A, where A is the total number of chairs and tables.
Now, he can make at most 15, but since he's already made 4 chairs and 3 tables, we need to remove that from our total to find the total amount he can make.


The x and y intercepts hit at 8, so thus, the answer must be the last graph.