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Kelas 8 MatematikaBab 4 - Sistem Persamaan Linear Dua Variabel
Misalkan
x = Apel
y = Jeruk
3x + 5y = 85.000 .....(×7)
5x + 7y = 123.000 ....(×5)
Eliminasi nilai y
21x + 35y = 595.000
25x + 35y = 615.000
________________ _
-4x = -20.000
x = -20.000/-4
x = 5.000
Substitusikan nilai x
3x + 5y = 85.000
3(5.000) + 5y = 85.000
15.000 + 5y = 85.000
5y = 85.000 - 15.000
5y = 70.000
y = 70.000/5
y = 14.000
Jadi harga 1 kg apel adalah Rp5.000,- dan harga 1 kg jeruk adalah Rp14.000,-
x + y = 5.000 + 14.000
x + y = 19.000