*f*(

*b*) =

*f*(3), that's another way of saying that you have two points, (

*b*,

*y*) and (3,

*y*), and the

*y*-values are the same. So look at the graph, and see what that

*y*-value is!

On the graph, I'm seeing the point (3,5), so our other point must be (

*b*,5). The only other place this graph goes through

*y*=5 is at (-1,5), so

*b*must equal -1.

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