The inequality x <= 8 represents the fact that Marissa can sell up to 8 framed photographs each week. It ensures that Marissa does not exceed this limit.
Similarly, the inequality y <= 40 represents the fact that Marissa can sell up to 40 greeting cards each week. It ensures that Marissa does not exceed this limit.
Both of these inequalities are necessary in this system because Marissa's selling capacity for framed photographs and greeting cards has a maximum limit. By setting these limits, we ensure that Marissa stays within her capacity.
If either of these inequalities were not included, Marissa could potentially sell more than the maximum allowed number of framed photographs or greeting cards, which would make the system unrealistic and inaccurate.