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Mapel : MatematikaBab : Sistem Persamaan Linear Dua Variabel
Diketahui :
- 2x + 3y = 8
- 3x + 5y = 14
- x = a
- y = b
Ditanya :
- Nilai 4a - 3b = ......?
Penyelesaian :
- Nilai x atau a :
(2x + 3y = 8) × 5
(3x + 5y = 14) × 3
10x + 15y = 40
9x + 15y = 42
——————— —
x = - 2
a = - 2
- Nilai y atau b :
2x + 3y = 8
2(- 2) + 3y = 8
- 4 + 3y = 8
3y = 8 + 4
3y = 12
y = 12/3
y = 4
b = 4
- Nilai 4a - 3b :
4a - 3b
= 4(- 2) - 3(4)
= - 8 - 12
= - 20
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