Question

7x+4y=1 dan 5x+2y= -1

tentukan himpunan penyelesaian dan metode eliminasi

Answer 1

7x + 4y = 1
10x + 4y = - 2
____________ -
- 3x = 3
    x = - 1
    y = 2

Answer 2

7x + 4y = 1 | dikali 1
5x + 2y = -1 | dikali 2

7x+4y=1
10x+4y= -2
--------------- -
-3x = 3 maka x = -1

Cari y: 7x+4y = 1
-7 + 4y = 1
4y = 8 maka y = 2