Pelesaian spldv 3× + 4y = 18 4× - 3y = -1, maka nilai x.y adalah

3x + 4y = 18 (4)
4x - 3y = - 1 (3)

12x + 16y = 72
12x - 9y = - 3
------------------ –
25y = 75
y = 3

4x - 3y = - 1
4x - 9 = - 1
4x = - 1 + 9
4x = 8
x = 2

maka

x . y
2 . 3
6

✔ senang bisa membantu, semoga bermanfaat ya :)

3x + 4y = 18       |x3|
4x - 3y  = -1        |x4|
---------------- + 

9x  + 12y = 54
16x - 12y = -4
--------------------- +
         25x = 50
             x = 2

4x - 3y = -1
8 - 3y = -1
-3y = -1 - 8
-3y = -9
y = 3


Maka 
= x.y
= 2 x 3
= 6

Semoga Membantu!!!