Answer:
4x + y = -1
Step-by-step explanation:
To get both variable terms on the same side, you can add 4x. Its coefficient will then be positive, and all coefficients are mutually prime, so you're done.
4x +y = 4x -4x -1 . . . 4x added to both sides
4x + y = -1 . . . . . . . simplify
