Tolong bantuanya. ya ​

Jawaban:

Nilai mn = –10 (C)

Penjelasan dengan langkah-langkah:

3x + 4y = 7

5x – 7y = 39

3x + 4y = 7 || × 5

5x – 7y = 39 || × 3

15x + 20y = 35

15x – 21y = 117

_____________-

41y = – 82

y = – 2

3x + 4y = 7

3x + 4(-2) = 7

3x – 8 = 7

3x = 7+8

3x = 15

x = 5

Nilai (m, n) = (5, – 2)

Jadi nilai mn= 5(-2) = – 10

Yang D Jawabanya

Soalnya Udah Diisi Dsitu 🙂