Answer:
1/4
Explanation:
When adding (or subtracting) fractions, ensure the denominators are the same by multiplying(or dividing) numerator and denominator by the same value. Then you can simply add(or subtract) the numerators and the resulting numerator value divided by the common denominator value is the answer
-2/4 + 6/8 can be written as 6/8 - 2/4
6/8 = 3/4 by dividing numerator and denominator by 2
6/8 - 2/4 = 3/4 - 2/4 = (3-2)/4 = 1/4