in which line is a mistake first made when solving the following system of equations by elimination for s

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

Line 3

-11s = -3

Line 4

s = 11/3

 

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