SOLUTION: The directions say to solve the system r-s=-3 r+s=9

Algebra ->  Radicals -> SOLUTION: The directions say to solve the system r-s=-3 r+s=9      Log On


   

Question 7607: The directions say to solve the system
r-s=-3
r+s=9
Answer by bonster(299) About Me  (Show Source):
You can put this solution on YOUR website!
r-s=-3
r+s=9
add the two, and you'll get:
2r=6
2r%2F2=6%2F2
r=3

In order to figure out the value of s, we need to multiply one set by -1
r-s=-3 -->-r%2Bs=3
r+s=9 -->r+s=9

add the two and you'll get:
2s=12
2s%2F2=12%2F2
s=6


r=3, s=6