Slope intercept form is:
y = mx + b
So all you have to do is isolate y
2x - 4y + 7 = 0
2x - 4y = -7
-4y = -7 - 2x
y = -7/-4 - 2x/-4
y = [tex]\frac{7}{4} + \frac{2x}{4}[/tex]
y = [tex]\frac{1x}{2} + \frac{7}{4}[/tex]
y = [tex]\frac{1}{2}x + \frac{7}4[/tex]
Hope this helped!