Preview question: Solve the system by substitution.x + y = 17x - y = 1

Behaviour being used: Adaptive mode

Minimum fraction: 0

Question summary: Solve the system by substitution. x + y = 17 x - y = 1: No solution; (-9, 9); (8, 9); (9, 8)

Right answer summary: (9, 8)

Question state: todo