GATE 2015 CS (CS3) – Question 5

General Aptitude · Quantitative Aptitude: Algebra, Geometry and Mensuration · 1 mark · Multiple choice

A linear function f has f(−2)=29 and f(3)=39. Find f(5).

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Correct answer: (C) 43

Explanation

The slope is (39−29)/(3−(−2))=10/5=2. Therefore increasing x from three to five increases f by four, yielding f(5)=43. Equivalently f(x)=2x+33. Thus C.

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