determine whether the statement below is always sometimes or never true justify your reasoning the Expressions Xand y - 3 represents the same value

Sometimes true.

For example if x=2 and y=5

You'd substitute 5 in for y, 5-3 and you'd get 2.

That would make x and y equal to one another

But if x=2 and y=4 and you substitute in the values 4-3=1 and they would not be equal.

It all depends on the x and y value, but sometimes it may be true.