The operation a \nabla b is defined by a \nabla b=\frac{a+b}{a-b} for all integers a and b with a \neq b. For example, 2 \nabla 3=\frac{2+3}{2-3}=-5. If 3 \nabla b=-4, what is the value of b ?
Answer Choices
A. 5
B. -7
C. 7
D. -5
E. 3
The operation a \nabla b is defined by a \nabla b=\frac{a+b}{a-b} for all integers a and b with a \neq b. For example, 2 \nabla 3=\frac{2+3}{2-3}=-5. If 3 \nabla b=-4, what is the value of b ?
Answer Choices
A. 5
B. -7
C. 7
D. -5
E. 3