This applet shows adding, subtracting, multiplying and dividing functions. Note that the graphs of [math]y=f(x)[/math] and [math]y=g(x)[/math] can be adjusted by dragging them or using the input boxes.[br][list=1][br][*]Turn on one operation. Select an x-value and look at the corresponding y-values. How are the y-values related?[br][br][*]Repeat for different functions, x-values and operations.[br][/list]