A student is ordering a flower arrangement. She can choose any combination of rose and carnations for her flower arrangement, and she does not want not spend more than $30. If roses cost $3 each and carnations cost $2 each, which inequality represents all possible combinations of x roses and y carnations?
Price of 'x' roses = 3x
Price of 'y' carnations = 2y added together must not exceed $30
3x + 2y < = 30