Question 412021
The first thing you want to do is to solve for y. putting it in slope intercept form y=mx+b
   x+2y= 3     subtract x from both sides
 -x    -x      x will cancel
    2y=-x+3   divide both sides by 2
     y= -x+3
          2   make the fractions 
y=-1/2x+3/2   any number with the x will be the slope and the b is y-intercept

answer= slope= -1/2 and Y-intercept= 3/2