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4x - y = 19 dikalikan 2
menjadi
3x + 2y = - 5
8x - 2y = 38 +
11x = 33
x = 33/11
x = 3
subtitusikan
3x + 2x = -5
3(3)+ 2y = -5
9 + 2y = -5
2y = -5 -9
2y = -14
y = -14/2
y = -7
bilai dari
x + y = 3 - 7
= -4
jawabnnya -4