TEST 14
1.
\(\left.\begin{aligned}a-b+3c=6\\3a+5b+c=10\end{aligned}\right\}\)
\(\Rightarrow a+b+c=?\)
A) \(2\)B) \(4\)C) \(7\)D) \(10\)E) \(16\)
2.
\(\left.\begin{aligned}2x-y+3z=4\\6z+4x+2y=12\end{aligned}\right\}\)
\(\Rightarrow y=?\)
A) \(-2\)B) \(1\)C) \(\samefrac32\)D) \(2\)E) \(4\)
3.
\(\left.\begin{aligned}x-y+3z=7\\3x-3y+z=-11\end{aligned}\right\}\)
\(\Rightarrow z=?\)
A) \(-1\)B) \(1\)C) \(2\)D) \(3\)E) \(4\)
4.
\(\left.\begin{aligned}2x+y+2z=9\\5\cdot\left(x+z\right)+6y=12\end{aligned}\right\}\)
\(\Rightarrow y=?\)
A) \(-7\)B) \(-3\)C) \(1\)D) \(2\)E) \(7\)
5.
\(\left.\begin{aligned}2a-b+3c=13\\4a+b+5c=37\end{aligned}\right\}\)
\(\Rightarrow a+b+c=?\)
A) \(9\)B) \(10\)C) \(11\)D) \(12\)E) \(13\)
6.
\(\left.\begin{aligned}7x+5y+z=3\\3x+y-3z=4\end{aligned}\right\}\)
\(\Rightarrow x+y+z=?\)
A) \(-\samefrac72\)B) \(-\samefrac14\)C) \(1\)D) \(\samefrac14\)E) \(\samefrac72\)
7.
\(\left.\begin{aligned}2x+3y-3z=3\\x-y-z=4\end{aligned}\right\}\)
\(\Rightarrow4x+y-5z=?\)
A) \(3\)B) \(4\)C) \(5\)D) \(7\)E) \(11\)
8.
\(\left.\begin{aligned}2a-b+7c=6\\3a+8c=15\end{aligned}\right\}\)
\(\Rightarrow a+b+c=?\)
A) \(3\)B) \(4\)C) \(7\)D) \(9\)E) \(10\)