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Mapel MatematikaBab Program Linear
Uang 200 = x
Uang 500 = y
Jumlah = 6.400
a) Jika x + y = 20
x = 20 - y
200x + 500y = 6.400
Maka,
200(20 - y) + 500y = 6.400
4000 - 200y + 500y = 6.400
300y = 2.400
y = 8 keping
x = 20 - y = 20 - 8 = 12 keping
Maka ada 8 keping lima ratusan dan 12 keping dua ratusan
b) Banyak maksimal Kepingan logam
200x + 500y ≤ 6.400
2x + 5y ≤ 64
x ≥ 0
y ≥ 0
Pada pers 2x + 5y ≤ 64 substitusikan x = 0 dan y = 0. Maka diperoleh titik potong:
(32, 0)
(0, 64/5)
Jadi, si anak maksimal dapat memegang 32 keping dua ratusan