Tolong di bantuh jawab kak no 11

5x + 2y = 16  (x3)
2x + 3y = 2    (x2)
------------------------
15x + 6y = 48
4x + 6y = 4
------------------------ -
11x = 44
x = 4

2x + 3y = 2
2(4) + 3y = 2
8 + 3y = 2
3y = 2-8
3y = -6
y = -2

maka nilai xy adalah 4 x (-2) = -8 (jawabanya C)

Matriks

x, y = (4, -2)
x y = 4(-2) = - 8