TEST 10
1.
\(\left.\begin{aligned}4x-3y=9\\x+y=4\end{aligned}\right\}\)
\(\Rightarrow x\cdot y=?\)
A) \(\samefrac32\)B) \(2\)C) \(3\)D) \(\samefrac72\)E) \(\samefrac92\)
2.
\(\left.\begin{aligned}7x-2y=5\\5y-4x=4\end{aligned}\right\}\)
\(\Rightarrow x+y=?\)
A) \(\samefrac13\)B) \(1\)C) \(3\)D) \(4\)E) \(5\)
3.
\(\left.\begin{aligned}2x+3y=12\\3x+2y=13\end{aligned}\right\}\)
\(\Rightarrow x\cdot y=?\)
A) \(-4\)B) \(3\)C) \(6\)D) \(12\)E) \(18\)
4.
\(\left.\begin{aligned}2x-y=2\\3x-2y=9\end{aligned}\right\}\)
\(\Rightarrow x\cdot y=?\)
A) \(20\)B) \(30\)C) \(42\)D) \(60\)E) \(75\)
5.
\(\left.\begin{aligned}4x+3y=-8\\3x+4y=-13\end{aligned}\right\}\)
\(\Rightarrow\samefrac yx=?\)
A) \(-4\)B) \(-1\)C) \(1\)D) \(4\)E) \(5\)
6.
\(\left.\begin{aligned}x-y=2xy\\x+y=10xy\end{aligned}\right\}\)
\(\Rightarrow x\cdot y=?\)
A) \(\samefrac16\)B) \(\samefrac1{12}\)C) \(\samefrac1{18}\)D) \(\samefrac1{24}\)E) \(\samefrac1{48}\)
7.
\(\left.\begin{aligned}ax+by=3\\bx+2ay=5\\\left(x,y\right)=\left(1,-1\right)\end{aligned}\right\}\)
\(\Rightarrow\left(a,b\right)=?\)
A) \(\left(8,5\right)\)B) \(\left(5,8\right)\)C) \(\left(-8,-11\right)\)D) \(\left(3,2\right)\)E) \(\left(4,7\right)\)
8.
\(\left.\begin{aligned}ax-by=4\\2bx+4ay=4\\\left(x,y\right)=\left(2,-1\right)\end{aligned}\right\}\)
\(\Rightarrow b=?\)
A) \(2\)B) \(3\)C) \(\samefrac72\)D) \(\samefrac92\)E) \(5\)