How can the factors of a polynomial be helpful in sketching a graph?

Which graph represents the equation y =4x

Rewrite the following quadratic functions in intercept or factored form. show your work. y = 9 + 12x + 4x^2

Erinn wrote the equation –5x + 4y = 32 to represent her hourly wage (y) and how this wage has changed during each year that she worked at a company (x). what is the rate of change in erinn's hourly wage per year?