Answer
They are congruent (both segments are 8 units long)
Work Step by Step
To find the length of a segment, find the positive difference of the two points.
For ZX, we have $|1-(-7)|=|1+7|=|8|=8$
For WY, we have $|5-(-3)|=|5+3|=|8|=8$
They are congruent.