suatu fungsi ditentukan dengan rumus f(×)=ax+b.jika f(3)=2 dan f(-2)=-8 maka f(×) adalah

f(x)= ax+b
f(3)= a(3)+b
2= 3a+b
b= 2-3a

f(-2)= a(-2)+b
-8= -2a+2-3a
-8-2= -5a
5a= 10
a= 10/5
a= 2

b=2-3a
b= 2-3(2)= 2-6= -4

f(x)= ax+b
f(x)= 2x+(-4)
f(x)= 2x-4

f(x) = ax + b

f(3) = a(3) + b = 2
= 3a + b = 2

f(-2) = a(-2) + b = -8
= -2a + b = -8

3a + b = 2
-2a + b = -8
___________ -
5a = 10
a = 2

3a + b = 2
3(2) + b = 2
6 + b = 2
b = -4

f(x) = ax + b
f(x) = 2x - 4