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f(x)=ax+b
eliminasi f(2) dengan f(4)
f(2)=2a+b ⇒ 4=2a+b
f(4)=4a+b ⇒10=4a+b
_______ -
-6 = -2a
a = 3
susbtitusi a pada f(2)
4=2(3)+b
b=4-6
b=-2
maka
f(x)=3x-2
f(1)=3(1)-2
f(1)=1