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1/3x - 1/2y = - 4
X 1
X 12
4x + 6y = 72
4x - 6y = - 48
12y = 120
y = 10
4x + 60 = 72
4x = 12
x = 3
nilai x + y ?
3 + 10 = 13
1/3x - 1/2y = -4 masing2 ruas dikali kpk penyebutnya
6(1/3x - 1/2y) = 6(-4) => 2x -3y = -24
4x + 6y = 72 4x + 6y = 72
2x - 3y = -24 (2) 4x - 6y = -48
------------------- - disubtitusi
0x + 12y = 130 , y = 10,83
2x - 3y = -24
2x - 3(10,83) = -24
2x - 32,5 = -24
2x = -24 +32,5
2x = 8,5 , x = 4,25
x + y = 4,25 + 10,83
x + y = 15 , 08