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f(2) = 1 --> 2a + b = 1
f(4) = 5 --> 4a + b = 5 _
-2a = -4
a = 2
2a + b = 1
2.2 + b = 1
4 + b = 1
b = 1 - 4
b = -3
f(x) = 2x - 3
f(10) = 2.10 - 3
= 20 - 3
= 17
semoga membantu ya :)
f(2)=1 ~ a.2+b=1
f(4)=5 ~ a.4+b=5
------------------------- -
-2a =-4
a =2
2a+b=1
2.2+b=1
4+b=1
b=-3
f(10)=2.10-3
=20-3
=17