suatu fungsi di nyatakan dengan f(x) = a x + b jika f(2) = 16 dan f (-2) = -8 nilai f(-4) adalah??

f(x) = ax + b
f(2) = a(2) + b ↝ 2a + b = 16 ....... ①
f(-2) = a(-2) + b ↝-2a + b = -8 .... ②

eliminasi ① dan ②
2a + b = 16
-2a + b = -8
------------------ --
4a = 24
a = 24/4
a = 6

2a + b = 16 ↝ 2(6) + b = 16 ↝ b = 4

f(x) = 6x + 4
f(-4) = 6(-4) + 4
f(-4) = -24 + 4
f(-4) = -20

semoga membantu ^^