The Marcos family consists of 2 adults and 4 children. They spent a total of $40 on circus tickets. Let x represent the cost of an adult ticket, and let y represent the cost of a child’s ticket. Which graph represents the possible costs of the tickets? On a coordinate plane, a line goes through points (0, 10) and (20, 0). On a coordinate plane, a line goes through points (0, 20) and (10, 0). On a coordinate plane, a line goes through points (negative 10, 0) and (0, 20). On a coordinate plane, a line goes through points (negative 20, 0) and (0, 10).