Dikeahui : f(x)=mx+n. jika f(-1)=2 dan f(2)= 11, nilai f(4) adalah......

-m + n = 2
2m +n = 11 dikurangi
-3m = -9
m = 3

-3 + n = 2
n = 5

f(4) 4.3 + 5 = 17

m= 3 dan n = 5. f(4) = 4m+n = 4*3 + 5 = 17. maaf kalau keliru