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Verified answer
2m + 3n = 19 | ×1 |m - 2n = -8 | ×2 |
-------------------------- -
2m + 3n = 19
2m - 4n = -16
-------------------- -
7n = 35
n = 5
m - 2n = -8
m - 2 (5) = -8
m - 10 = -8
m = 2
Maka,
3m + n
= 3 (2) + 5
= 6 + 5
= 11
Jawaban : B