Discussion
Sum of 2s + 4t -3u + 5v, -s + 2t + 9u - 11v and 3s - 4t + 2u - 3v is
Answer: D
Collect each variable across the three expressions.
\[ s: \ 2 - 1 + 3 = 4 \]
\[ t: \ 4 + 2 - 4 = 2 \]
\[ u: \ -3 + 9 + 2 = 8 \]
\[ v: \ 5 - 11 - 3 = -9 \]
\[ \therefore\ 4s + 2t + 8u - 9v \]
The options differ only in the signs of the \( t \) and \( u \) terms, so those two columns decide the answer.
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