Question 1015617
in which line is a mistake first made when solving the following system of equations by elimination for s?
2r + 7s = 11
r - 9s = -7


Line 1
2r + 7s = 11
2(r - 9s = -7)
Line 2
2r + 7s = 11
2r - 18s = -14 **************
------------- Subtract
25s = 25
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Line 3
-11s = -3
Line 4
s = 11/3