Question 198899
5r-6s=21
6r+5s=74

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Multiply thru the 1st by 5 and the 2nd by 6 to get:
25r - 30s = 105
36r + 30s = 444
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Add to get:
61r = 549
r = 9
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Substitute to solve for "s":
5*9 -6s = 21
45 -6s = 21
-6s = -24
s = 6
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Cheers,
Stan H.