Final answer:
The equation can be written in standard form as 2x - y = -9.
Step-by-step explanation:
The equation y = 2x +9 can be written in standard form using integers as 2x - y = -9. This form is also known as the standard form of a linear equation, which can be written as Ax + By = C, where A, B, and C are integers.
Learn more about standard form of a linear equation