The answer would be 1/3. You have to work backwarda for this problem. You start off by subtracting 5/4 - 3/4 =2/4 which simplifies to 1/2. Then, you have to add 1/6. Using the greatest common denominator, you have 3/6 + 1/6=4/6 which simplifies to 2/3.
The correct answer to your problem is B.
y-4 = 3(x-2)
Start by multiplying both sides of the equation by 7 (the common denominator).

Add 4z to both sides.

Add 189.
1 3/8 +2 7/83+3/8+7/8
3+1 2/8
3+1 1/4
4 1/4