What is 13/24 in its lowest fraction cancelling the prime factors?

If you want to reduce a fraction to lowest terms, you don't cancel
prime factors.  You cancel common factors.

The factors of  13  are  1  and  13 .

The factors of  24  are  1,  2,  3,  4,  6,  8,  12, and  24 .

The only common factor of  13  and  24  is ' 1 '.

So the fraction  13/24  is already in lowest terms,
and can't be reduced further.

Xis -1/2
y is 35/4.