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misal.....m
persamaan 1 dan 2
3m + 2n - 4p = -23 ---> x 2
2m + 4n + 3p = -3 ----> x 3
6m + 4n - 8p = - 46
6m + 12n + 9p = -9
_______________ -
0 - 8n -17p = -37 ..................a)
persamaan 2 dan 4
2m + 4n + 3p = -3 ----> x 2
4m - 3n + 5p = 55
4m + 8n + 6p = -6
4m - 3n + 5p = 55
______________ -
0 + 11n + p = -61 ....b) p = -11n - 61
persamaan a dan b disubtitusikan
-8n - 17p = -37
-8n - 17(-11n - 61) = -37
-8n + 187n + 1.037 = -37
179n = -37 - 1.037
179n = -1.047
n = -6
p = -11n - 61
p = -11(-6) - 61
p = 66 - 61
p = 5
2m + 4n + 3p = -3
2m + 4(-6) + 3(5) = -3
2m - 24 + 15 = -3
2m = -3 + 24 - 15
2m = 6
m = 3
nilai m - p + 2n = 3 - 5 + 2(-6)
= -2 - 12
= -14