Kaka tolong jawB no 16 n 17

16. Misalnya :
mangga=m
Jeruk= j
5m+2j = 82500 |×1| 5m+2j= 82500
3m + j = 47500 |×2|6m+2j= 95000 -
m = - 12500
m = 12500 karena harga tidak mungkin negatif
Subtitusi m= 12500 ke pers (2)
3.12500 +j = 47500
37500 + j = 47500
j = 47500 - 37500
j = 10000
Jadi harga mangga = 12500 dan harga jeruk =10000
Maka, 4m + 3j = 4.12500 + 3.10000
=50000 + 30000 = 80000
Jadi jawabannya b. 80000

17.
f(x) = 4x-8
f(k) =12
f(k) = 4k-8 = 12
4k = 12+8
4k = 20
k = 5
Jadi jawabannya d. 5