Fungsi f(x) = ax+b jika f(3)= -10 dan f(2)=0 tentukan: A. Nilai a dan b B. F(5)

f(x) = ax+b
f(3) = -10
f(2) = 0

kita buat fungsinya terlebih dahulu.
f(3) = -10
3a+b = -10

f(2) = 0
2a+b = 0

eliminasi kedua fungsi

3a+b = -10
2a+b = 0
________ -
a = -10
-20 + b = 0
b = 20

f(5) = -10x + 20
f(5) = -50 + 20
f(5) = -30

A. 
3a+b=-10
2a+b= 0
------------  -
 a = -10
 
2(-10)+b= 0     
-20 + b= 0
b=0+20
b= 20

B.
f(5)=a(5)+b
        -10(5) + 20= -50+20=30

Semoga membantu:)