Final answer:
To graph the equation y = fx+3, add 3 to the y-values of the existing graph of y = fx.
Step-by-step explanation:
To graph the equation
to add 3 to the y-values of the existing graph of y = fx. Since the original graph has a y-intercept of 9 and a slope of 3, we can simply move the entire graph up by 3 units. This means that each y-value of the original graph should be increased by 3.
For example, if the original graph had a point (x, y) with y = 12, the new graph will have a corresponding point (x, y+3) with y+3 = 12+3 = 15.
By applying this adjustment to all the points on the original graph, we will obtain the graph of y = fx+3.