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f(x)=ax+b
f(3)=a(3)+b=15
=3a+b=15
f(5)=ax+b
=a(5)+b=20
=5a+b=20
b=20-5a
subsitusikan persamaan 2 ke 1
3a+b=15
3a+(20-5a)=15
3a+20-5a=15
3a-5a=15-20
-2a=-5
a=-5/-2= 2,5
a. jadi, bentuk fungsinya: f(x)=2,5x+17,5
b. f(-2)=2,5x+17,5
=2,5(-2)+17,5
= -5+17,5
= 12,5
plis, dijadikan yg terbaik