Standard form of Y=3x+9

3x - y = - 9

Step-by-step explanation:

the equation of a line in standard form is

Ax + By = C (A is a positive integer and B, C are integers)

rearrange y = 3x + 9 into this form

subtract y from both sides

0 = 3x - y + 9 (subtract 9 from both sides)

3x - y = - 9 ← in standard form