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f(0)=a(0)+b=5
b=5
f(-2)= a(-2)+b=-1
-2a+5=-1
-2a=-1-5 ---> a= -6/-2
a=3
f(5) = a(5)+b=3(5)+5=15+5=20
jadi nilai f(5)=20
f(-2) = 1
f(0) = 5
ditanyakan :f(5)
jawab : f(-2) = -2a + b = 1 f(-2) = ax + b
f(0) = b = 5 1 = 2(-2) + b
-2a = -4 1 = -4 + b
a = 1+ 4 = b
a = 2 b = 5
f(5) = ax + b
= 2(5) + 5
= 10 + 5
= 15