SOLUTION: solve by the elimination method
7r-8s=-21
8r+7s=89
a.the solution is?
b.there are infinitely many solutions
c.there is no solution
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Question 420710: solve by the elimination method
7r-8s=-21
8r+7s=89
a.the solution is?
b.there are infinitely many solutions
c.there is no solution
Answer by mananth(16946) (Show Source): You can put this solution on YOUR website!
7r-8s =-21 .............1
8r+7s= 89 .............2
multiply (1)by 7
Multiply (2) by 8
49 r + -56 s = -147
64 r + 56 s = 712
Add the two equations
113 r = 565
/ 113
r = 5
plug value of r In (1)
7 r + -8 s = -21
35 + -8 s = -21
-8 s = -21 + -35
-8 s = -56
s = 7
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