Adding two functions results in h(x) = -x + 9, while multiplying the same functions results in jx) = -9x. Which statements describe f(x) and g(), the original functions? Select two options.
Both functions must be quadratic.
Both functions must have a constant rate of change.
Both functions must have a y-intercept of O.
The rate of change of either f(x) or g(x) must be 0.
The y-intercepts of f(x) and g(x) must be opposites.