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f(2) ⇒ 2a + b = 7
f(5) ⇒ 5a + b = 13 (eliminasi b)
-3a = -6
a = -6 : -3
a = 2
a=2 ⇒ 2a + b = 7
2(2)+ b = 7
4 + b = 7
b = 7-4
b = 3
jadi, f(x)=2x+3
f(10) = 2(10) + 3
= 20 + 3
= 23
itu menurutku maaf jika salah