Use the elimination method to solve the system of equations

Question

5u+2v=15
3u+v=-7

Answer 1

1st one: 5u + 2v = 15
double the 2nd: 6u + 2v = -14

subtract them:
-u = 29
u = -29

sub into 2nd:
3(-29) + v = -7
v= -7 + 87 = 80

u = -29 , v = 80