Answer:
2y + 17
Step-by-step explanation:
x and y will be used to represent the prime numbers
x is the larger,
y is the smaller
x - y = 17
that means that
x = y + 17
so then
x + y
= y + 17 + y
= 2y + 17
more information must be given to solve this problem, but for now, a general equation is
2y + 17