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21. [ B ] 5x + y = 7
3x - y = 9 + Eliminasi
8x = 16
x = 2
5x + y = 7
5(2) +y = 7
10 +y = 7
y = -3
x + y = 2 + (-3) = -1
Mohon dikoreksi jika salah, jadikan jawaban terbaik ya :)