SOLUTION: How do you solve 5r-s=5,-4r+5s=17 for substitution property???

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Question 434204: How do you solve 5r-s=5,-4r+5s=17 for substitution property???
Answer by rfer(16322) About Me  (Show Source):
You can put this solution on YOUR website!
5r-s=5 s=5r-5
-4r+5s=17
-4r+5(5r-5)=17
21r=42
r=2
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-4r+5s=17
-4*2+5s=17
5s=25
s=5
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5*2-5=5