x values= 1, 2, 3, 4 and y values= 1, 2, 4, 8
i'm assuming the first thing you do is plot the points onto a graph
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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