Tolong dijawab yg no 9 dan 10 pake cara, dijawab 1 soal jg gpp :) thanks

No.9
3x + 2y - 4 = 0 ---> (-4, a)
3(-4) + 2(a) - 4 = 0
-12 + 2a - 4 = 0
-16 + 2a = 0
2a = 16
a = 16/2
a = 8

No.10 sama seperti di atas