Answer :
To add and subtract fractions, the denominators ( bottom numbers ) must be equal.
So, we have to multiply 1/2 by 4/4
[tex]\frac{1}{2}\cdot\frac{4}{4}=\frac{4}{8}[/tex]So:
[tex]\frac{6}{8}-\frac{4}{8}=\frac{2}{8}[/tex]simplify by 2
[tex]\frac{1}{4}[/tex]