Start by writing the equation in slope intercept form
[tex]y=mx+b[/tex]using this
[tex]\begin{gathered} 2y=4-x \\ y=\frac{4}{2}-\frac{x}{2} \\ y=-\frac{1}{2}x+2 \end{gathered}[/tex]according to this the slope of the line is -1/2 and the y-intercept is 2.