Question

Diketahui f[x]=mx+n,jika f[-2]= -1,dan f[3]=14,nilai f[-10] adalah..
TOLONG JAWAB YA !

Answer 1

1. -2m + n = -1
2. 3m + n = 14
--------------------- -
-5m = -15
m = 3
.-2×3 + n = -1
n = 5
f(x) = 3x + 5

f(-10) = -25

Answer 2

F(x) = mx + n

f(-2) = m(-2) + n
-1 = -2m + n ....(1)

f(3) = m(3) + n
14 = 3m + n ....(2)

eliminasikan n dari persamaan (1) dan (2)
-1 = -2m + n
14 = 3m + n
_________ -
-15 = -5m
m = -15/-5 = 3

masukkan nilai m ke persamaan (1)
-1 = -2m + n
-1 = -2(3) + n
-1 = -6 + n
n = -1 + 6 = 5

f(x) = mx + n
f(x) = 3x + 5
f(-10) = 3(-10) + 5
= -30 + 5 = -25