tusharrgarg93
Can someone help in explaining these how to tackle these type of questions? I’m struggling to understand from the explanations provided.
is-x-z-y-z-1 ... l#p1243251
These types of question can be tackled by testing values, rather than solving the algebra
Statement one:
x=y
If we simply substitute into the two equations, they are exactly the same thing -> |y-z|=|y-z|
Sufficient.
Statement 2:
|x|=|y|
Be careful here:
We can have two situations
x=-y or x=y
We already know from 1) that x=y is true, but what about x=-y?
|-y-z|=|y-z|? Clearly not.
Imagine that z=1, y=2 (and therefore x=-2)
You would have |-2-1|=|2-1| -> |-3|=|1| which is false.
As there are two conflicting statements, B is not sufficient.
Answer choice must be A.