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MathNet 2017-part-06 — 176 problems (EN–VI) Question 65

Math Olympiad Vault · MathNet 2017-part-06 — 176 problems (EN–VI)

Question 65

A linear function $f$ satisfies $f(-1)+f(3)=-8$ and $f(1)+f(5)=4$. What is $f(2)+f(7)$?
(A) 12
(B) 13
(C) 14
(D) 15
(E) 16