0
2r + 2s = 50
2r - s = 17 therefore 4r - 2s = 34
Add so that you can eliminate one of the variables:
2r + 2s = 50
4r - 2s = 34
----------------
6r + 0s = 84
Solve for r:
6r = 84
r = 14
Substitute r into one of the original equations:
2(14) + 2s = 50
28 + 2s = 50
2s = 22
s = 11
Doublecheck with the other original equation:
2(14) - 11 = 28 - 11 = 17
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