SOLUTION: Solve by the elimination method 5r - 8s = -3 8r + 5s = 102 I came up with (9,6) r being 9 and s being 6. Is that correct?

Algebra ->  Equations -> SOLUTION: Solve by the elimination method 5r - 8s = -3 8r + 5s = 102 I came up with (9,6) r being 9 and s being 6. Is that correct?       Log On


   

Question 427417: Solve by the elimination method
5r - 8s = -3
8r + 5s = 102
I came up with (9,6) r being 9 and s being 6. Is that correct?
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!


Hi, Yes! You are exactly corect

Solving by the elimination method 

5r - 8s = -3

8r + 5s = 102 



25/8r - 5s = -3*5/8   |multiplying 1st EQ by 5/8

 8r   + 5s = 102 

  89/8 r = -15/8 + 102

    89r  = -15 + 816

    89r = 801

      r = 9   and s = (5r+3)8 = 48/8=6