Diketahui SPLTV berikut
3m+2n-4p=-23
2m+4n+3p=-3
4m-3n+5p=55
nilai m-p+2n adalah?.
Pertama tentukan variabel yang akan dihilangkan
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