Question

Diket fungsi f(x) = mx+n , jika f(2) = -2 dan f(-3)= 13 , berapa nilai f(4)?

Answer 1

F(x) = mx + n
f(2) = 2m + n
2m + n = -2 .......(1)
f(-3) = -3m + n
-3m + n = 13......(2)

2m + n = -2
-3m + n = 13
------------------- —
5m = -15
m = -3

2m + n = -2
2(-3) + n = -2
n = -2 + 6
n = 4

f(x) = -3x + 4
f(4) = -3(4) + 4
f(4)= -12 + 4 = -8