Write two linear functions, (x) and g(x). for example, f(x) = 3x - 7 and
g(x) = -2x + 5. then see whether rx) - (-9(x)) is equivalent to f(x)+ g(x). hint:
to find -9(x), just change the signs of all the terms in g(x). discuss whether
you think your results would apply to every function.