7x - 9y = 39 35x - 45y = 195 For any real number r, which ...

Prompt

7x - 9y = 39 35x - 45y = 195 For any real number r, which of the following points lies on the graph of both equations? A) (3r, (7r - 13)/3) B) ((7r + 13)/3, 3r) C) (-7r/-9 + 39, 7r/9 + 195) D) (r/5 + 39, -r/5 + 195)