33:
a: \(\Leftrightarrow\left\{{}\begin{matrix}4x+3y=-7\\4x-10y=32\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}13y=-39\\2x-5y=16\end{matrix}\right.\)
=>y=-3; x=1/2
b: \(\Leftrightarrow\left\{{}\begin{matrix}-15x+9y=66\\15x+10y=10\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}y=4\\x=-2\end{matrix}\right.\)
c: \(\Leftrightarrow\left\{{}\begin{matrix}3x+3+2y+x=0\\5x+5y+3x-y=-5\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}4x+2y=-3\\8x+4y=-5\end{matrix}\right.\)
=>PTVN
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