Samuel has to sell concert tickets worth at least $90. the price of a child ticket is $8, and the price of an adult ticket is $15. let y be the number of child tickets sold and x be the number of adult tickets sold. which of the following graphs best models this situation? line joining ordered pairs 0, 11.25 and 6, 0. shade the portion of the graph below this line which lies within the first quadrant line joining ordered pairs 0, 11.25 and 6, 0. shade the portion of the graph above this line which lies within the first quadrant line joining ordered pairs negative 4, 8 and 6, 3. shade the portion of the graph below this line which lies within the first quadrant line joining ordered pairs negative 4, 8 and 6, 3. shade the portion of the graph above this line which lies within the first quadrant