Question 50819
How does replacing f(x) by f(x) + 4 in y = f(x) affect the graph of y = f(x) 
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If you start with y=f(x) as a graph
and you then graph y=f(x)+4 you are
changeing all the y-values.  Each
y-value from the 1st graph is increased
by 4.  Thus you get a graph that is 
4 higher.

cheers,
Stan H.