The standard form of an equation is
[tex]ax + by = c[/tex]
In the question, we have the following formula
[tex]3x + 1 = 2y[/tex]
To get the formula in standard form, we first have to subtract 2y from both sides (since we need to get 2y on the left side)
[tex]3x - 2y + 1 = 0[/tex]
Finally we subtract 1 from both sides (since we need the number on the right side)
[tex]3x - 2y = - 1[/tex]
Hence, 4. is the correct answer.
