Mohon bantuannya terima kasih

⅔ x - ¼ y = 5 → kedua ruas kali 12

8x - 3y = 60....... (1)


7/6 x + 3/2 y = 1 → kedua ruas kali 6

7x + 9y = 6........ (2)



Persamaan 1 dan 2 eliminasi

8x - 3y = 60 → kali 3
7x + 9y = 6 → kali 1
..............
24x - 9y = 180
7x + 9y = 6
............ . ............. +

31x = 186

x = 6 → nilai a



→ tentukan nilai y

8x - 3y = 60

8(6) - 3y = 60

48 - 3y = 60

-3y = 60 - 48

-3y = 12

y = 12/-3

y = -4 → nilai b


Maka,

= a + 2b

= 6 + 2(-4)

= 6 - 8

= - 2 → opsi jawaban B