C

2000020301

Level: 
C
Solve the given system of equations in the set of real numbers. \[ \begin{aligned} x+y&=-5\\ 1+\sqrt{2x+4y}&=\sqrt{x+3y}\\ \end{aligned}\] In the following list identify a true statement.
\(x=-12,\ y=7\)
\(x=12,\ y=7\)
The system has no solution.
The system has infinitely many solutions.

2000019110

Level: 
C
Determine the set of all values of the real parameter \( a \) for which the equation has a unique solution. \[ \frac{a(x+2)-3(x-1)}{x+1} = 1 \]
\(\mathbb{R} \setminus \{-6;4\}\)
\(\mathbb{R} \setminus \{-1;-2;1\}\)
\(\mathbb{R} \setminus \{0;-1\}\)
\(\mathbb{R} \setminus \{4\}\)