Question 23257
Standard form is ax + by = c
If 2x-y= -3 then 2x + (-1)y = -3 is the equation 
in standard form.

1) y=(2/3)x -2
  3y=2x-6
  2x + (-3)y= 6

2) y= (-1)x+0
   (-1)x + (-1)y =0

3)  y = (-1/2)x - 4
   2y = -x-8
   x+2y = -8

Cheers,
Stan H.