Question

Fungsi (f) yang dirumuskan dengan f(x) = ax + b .diketahui bahwa f(3) = 9 dan f(-2)= 17. nilai a dan b adalah......

tolong pake jalan ya..

Answer 1

F(3)=9
3a+b=9
b=9-3a
f(-2)=17
-2a+b=17
-2a+9-3a=17
-5a=17-9
-5a=8
a=-8/5= -1 3/5
b=9-3a
b=9-3(-8/5)
b=9+24/5
b=45/5+24/5
b=69/5
b=13 4/5

Answer 2

F(x) = ax + b

f(3) = a(3) + b
9 = 3a + b.........(1)

f(-2) = a(-2) + b
17 = -2a + b.......(2)

eliminasikan persamaan (1) dan (2)
9 = 3a + b
17 = -2a + b
-8 = 5a
a =

9 = 3a + b
9 = 3( + b
b = - 9
b =