Investigate the unknown values in the equation x y=9 . Which of the following statements must be true?(1 point) Responses Both x and y must be positive values. Both x and y must be positive values. There is only one solution: x=4 and y=5. There is only one solution: x equals 4 and y equals 5 . There are infinitely many solutions to this equation. There are infinitely many solutions to this equation. Both x and y can be negative values.
