5u+2v=-15

Question

3u+v=-8 Im not sure how to do this problem

Answer 1

double the 2nd:
6u + 2v = -16
5u + 2v = -15
subtract them:
u = -1
sub into 2nd:
-3 + v = -8
v = -5

v = -5 and u = -1

(curious why you called this "college math", this is grade 7 )