6a + b
eliminasi pers 1 dan 2
15x - 3y = - 36
2x + 3y = 19
--------------------- +
17x = -17
x = -17/17
x = -1
2(-1) + 3y = 19
-2 + 3y = 19
3y = 19 + 2
3y = 21
y = 21/3
y = 7
Maka:
= 6(-1) + 7
= -6 + 7
= 1
Jadi, nilai 6a + b adalah 1.
___________________________________________
Cari Dulu Nilai x Atau y :
2x + 3y = 19 | × 5 | [ Pers 1 ]
5x - y = -12 | × 2 | [ Pers 2 ]
10x + 15y = 95 [ Pers 3 ]
10x - 2y = -24 [ Pers 4 ]
___________ -
17y = 119
y = 119/17
Subtitusikan Nilai y Ke Pers 1 :
2x + 3(7) = 19
2x + 21 = 19
2x = 19 - 21
2x = -2
x = -2/2
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Diketahui
Ditanya
6a + b
Penyelesaian
eliminasi pers 1 dan 2
15x - 3y = - 36
2x + 3y = 19
--------------------- +
17x = -17
x = -17/17
x = -1
2x + 3y = 19
2(-1) + 3y = 19
-2 + 3y = 19
3y = 19 + 2
3y = 21
y = 21/3
y = 7
Maka:
6a + b
= 6(-1) + 7
= -6 + 7
= 1
Kesimpulan
Jadi, nilai 6a + b adalah 1.
SOAL 1
___________________________________________
Cari Dulu Nilai x Atau y :
2x + 3y = 19 | × 5 | [ Pers 1 ]
5x - y = -12 | × 2 | [ Pers 2 ]
___________________________________________
10x + 15y = 95 [ Pers 3 ]
10x - 2y = -24 [ Pers 4 ]
___________ -
17y = 119
y = 119/17
y = 7
___________________________________________
Subtitusikan Nilai y Ke Pers 1 :
2x + 3(7) = 19
2x + 21 = 19
2x = 19 - 21
2x = -2
x = -2/2
x = -1
___________________________________________
6a + b
= 6(-1) + 7
= -6 + 7
= 1
___________________________________________