x values= 1, 2, 3, 4 and y values= 1, 2, 4, 8

Ok,

i'm assuming the first thing you do is plot the points onto a graph

Points

(1,1),(2,2,)(3,4),(4,8)

Plot these on to a piece of paper

This looks like a non linear piecewise function

notation example for writing http://www.shelovesmath.com/algebra/advanced-algebra/piecewise-functions/

Answer: f(x)=[y=x if x<=2

[y=1+x if x=3

[y=2x if x=4

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