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Misalkan harga satu kg jeruk = j
3m + 4j = 81.000 |×2| 6m + 8j = 162.000
2m + 6j = 104.000 |×3| 6m + 18j = 312.000
-10j = -150.000
j = 15.000
3m + 4j = 81.000
3m + 4(15.000) = 81.000
3m + 60.000 = 81.000
3m = 81.000 - 60.000
3m = 21.000
m = 7.000
5m + 5j = 5(7.000) + 5(15.000)
= 35.000 + 75.000
= 110.000
Jadi jawabannya adalah yang C Rp 110.000,00.
f(x) = -2x + 7
f(k) = -2k + 7
17 = -2k + 7
2k = 7 - 17
2k = -10
k = -5
Jadi jawabannya adalah yang D. -5.