求ＰＲＥＰ－ＤＳ－１－１４８思路

In the xy-plane, does the line with equation y = 3x + 2 contain the point (r, s) ?

(1)  (3r + 2 - s)(4r + 9 - s) = 0

(2)  (4r - 6 - s)(3r + 2 - s) = 0

由１可得　Ｒ＝－７，Ｓ＝１９，

由２可得　Ｒ＝８　　Ｓ＝２６

两个都在y = 3x + 2 啊，为什么答案是Ｃ不是Ｄ呢？

困惑了．．．