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
Added by -Scar F.
Step 1
In Line 2, there is a mistake. The equation 2(r - 9s = -7) should be 2r - 18s = -14. This is because when we multiply the second equation by 2 to eliminate the s term, we need to distribute the 2 to both terms on the left side of the equation. Line 3 is correct, Show more…
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