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Mapel : MatematikaBab : Sistem Persamaan Linear Dua Variabel
Diketahui :
- 2x + y = 7
- 4x - 2y = 2
- x = p
- y = q
Ditanya :
- Nilai x atau p = ......?
- Nilai y atau q = ......?
- Nilai 4p + 3q = ......?
Penyelesaian :
- Nilai x atau p :
2x + y = 7
y = 7 - 2x
4x - 2y = 2
4x - 2(7 - 2x) = 2
4x - 14 + 4x = 2
4x + 4x = 2 + 14
8x = 16
x = 16/8
x = 2
p = 2
- Nilai y atau q :
y = 7 - 2x
y = 7 - 2(2)
y = 7 - 4
y = 3
q = 3
- Nilai 4p + 3q :
4p + 3q
= 4(2) + 3(3)
= 8 + 9
= 17
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