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Mapel : MatematikaBab : Sistem Persamaan Linear Dua Variabel
Diketahui :
- 3x - y = - 13
- 2x + 3 = - 5y
- x = a
- y = b
Ditanya :
- Nilai 2a - 10b = ....?
Penyelesaian :
- Nilai x atau a :
3x - y = - 13
- y = - 13 - 3x
y = 3x + 13
2x + 3 = - 5y
2x + 3 + 5y = 0
2x + 5y = - 3
2x + 5y = - 3
2x + 5(3x + 13) = - 3
2x + 15x + 65 = - 3
17x = - 3 - 65
17x = - 68
x = - 68/17
x = - 4
a = - 4
- Nilai y atau b :
y = 3x + 13
y = 3(- 4) + 13
y = - 12 + 3
y = 1
b = 1
- Nilai 2a - 10b :
2a - 10b
= 2(- 4) - 10(1)
= - 8 - 10
= - 18
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