What is x and y on a graph

Which choice represents the sample space ,s for this event

The party planning committee has to determine the number of tables needed for an upcoming event. if a square table can fit 8 people and a round table can fit 6 people, the equation 150 = 8x + 6y represents the number of each type of table needed for 150 people.

Find the interior angle of a regular polygon which has 6 sides