Fungsi dirumuskan sbagai f(x)= ax+ b . Bayangan dri -2 adalah -1 dan bayangan dari 3 adalah 14 , nilai dri f(5) adalah?
Ayuabryana
F(x) = ax + b f(-2) = a. -2 + b = -1 f(3) = a. 3 + b = 14 -5a = -15 a = -15/-5 = 3 a.-2 + b = -1 3. -2 + b = -1 -6 + b = -1 b = -1 + 6 b = 5
f(-2) = a. -2 + b = -1
f(3) = a. 3 + b = 14
-5a = -15
a = -15/-5 = 3
a.-2 + b = -1
3. -2 + b = -1
-6 + b = -1
b = -1 + 6
b = 5
f(5) = ax + b
f(5) = 3.5 + 5
f(5) = 15 + 5
f(5) = 20
f ( - 2 ) = -2a + b = -1
f ( 3 ) = 3a + b = 14
------------------- -
- 5 a = - 15
a = 3
3a + b = 14
3(3) + b = 14
9 + b = 14
b = 14 - 9
b = 5
fungsinya adalah f(x) = 3x + 5
f(5) = 3(5) + 5
= 15 + 5
= 20