#2**+1 **

Since we have a "<" sign, the graph will have a dashed line....thus....only the top graphs are possible

Pick (0,0) and put it into the inequality....if it makes the inequality true, then the solution area will contain this point

18(0) - 3(0) < -21

0 < - 21

This is not true, so (0,0) isn't in the solution area....so......the top left graph is correct

CPhill
Dec 19, 2017