Question

Diket rumus fungsi f(x)=ax+b.
Jika f(-3)=-39. Dan f(5)=49.
Tent. Nilai f(1)+f(3).
.. Jwb dgn caranya yaa..

Answer 1

F (x) = ax + b
f (-3) = -3a + b = -39
f (5) = 5a + b = 49       -
-8a = -88
a = 11
5a + b = 49
5.11 + b = 49
b = 49 - 55
= - 6

f(1) = ax + b 
=11 - 6 = 5
f 3 = 33-6 = 27
27 + 5 = 32

Answer 2

F(x) = ax + b

f(-3) = -3a + b = -39
f(5) = 5a + b = 49
__________________-
-8a = -88
a = 11

f(5) = 5.11 + b = 49
55 + b = 49
b = -6


f(1) = 1 . 11 + (-6)
= 11 - 6 = 5

f(3) = 3 . 11 + (-6)
= 33 - 6
= 27

f(1) + f(3) = 5 + 27
= 32