Question

Fungsi f dirumuskan dengan f(x)=ax+b.jika f(4)=17 dan f(-4)=-7, maka rumus fungsi f adalah

Answer 1

F(x) = ax + b
f(4) = a(4) + b

4a + b = 17

f(-4) = a(-4) + b
-4a + b = -7

4a + b = 17
-4a + b = -7
____________ -
8a = 24
a = 24/8
a = 3

4a + b = 17
4(3) + b = 17
12 + b = 17
b = 17 - 12
b = 5

f(x) = ax + b
f(x) = 3x + 5