Posted by samuel on Saturday, January 26, 2013 at 5:19pm.
sketch a graph.
one value of y for every value of x
certainly a function
In fact a straight line of form y = mx+b
slope = 1 goes through those points
y = x + b
9 = 0 + b
b = 9
so a function that easily fits those points is
y = x + 9
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