Sorry, given that p<q!
Thank you so much in advance!
There appears to be something wrong in your equation.
From variance equation you should get
p^2 + q^2 - 10(p+q) = -33
OR (p+q)^2 - 2pq -10 (p+q) = -33
(15)^2 - 2pq -150 = -33
225 -2pq - 150 = -33
2pq = 108 OR pq = 54
Now u have. Two equations
P + q = 15 and pq = 54
Solve the see and you will get two values of p as 9 and 6
since p < q select p = 6 And q will be 9