1/4x + 2/3y = 2 1/2 dan 3/4x + 1/2y = 3 nilai dari 2x+y adalah..

1/4x + 2/3y = 2 1/2 |dikali 3
3/4x + 1/2y = 3 |dikali 1

3/4x + 2y = 7 1/2
3/4x + 1/2y = 3
___________ -
1 1/2y = 4 1/2
y = 3

3/4x + 2y = 7 1/2
3/4x + 2 . 3 = 7 1/2
3/4x = 7 1/2 - 6
x = 1 1/2 : 3/4
x = 2

nilai dari
2x + y =
2 . 2 + 3 = 7