Question 143765
If (3,-6) are coordinates of a point on the graph of y=f(x), give the coordinates of a point on the graph of y=f(x)-4.

Use the coordinates (3,-6) and plug them into the second function.  So y=f(x)-4 becomes y=f(3)-4. or y=-1. So when x is 3, y is -1.  This means a coordinate for the graph of y=f(x)-4 is (3,-1).