Question

Di ketahui Sistem Persamaan
3x + 7y =1
2x - 3y =16
Nilai xy =

(PAKAI CARA)

Answer 1

(×2)3x + 7y = 1
(×3)2x -3y  = 16

6x + 14y = 2
6x - 9y =48      -
23y = -46
y = -46÷23
y = -2

2x - 3(-2) = 16
2x +6 = 16
2x = 16-6
2x=10
x= 10÷2
x= 5

x.y=...
-2×5= -10