college algebra
posted by pam .
3r8s=10 8r+3s=51

multipy the upper equation by three, the lower by 8
9r24s=30
64r+24s=408
add the equations
73r=438
r=6
then go back and substitute and find s.
posted by pam .
3r8s=10 8r+3s=51
multipy the upper equation by three, the lower by 8
9r24s=30
64r+24s=408
add the equations
73r=438
r=6
then go back and substitute and find s.