a)
[tex]\left \{ {{2\left(x-1\right)+y=-2} \atop {4x+3y-2=0}} \right. \\\\x=\frac{-2-y}{2}+1\\\\4\left(\frac{-2-y}{2}+1\right)+3y-2=0\\\\-2y+3y-2=0\\\\y-2=0\\\\y=2\\\\x=\frac{-2-2}{2}+1\\\\x=-1\\\\x=-1,\:y=2[/tex]
b)
[tex]\left \{ {{8-3x+2\left(y-1\right)=-7} \atop {2x+7y=-8}} \right. \\\\\left \{ {{x=-\frac{-2y-13}{3}} \atop {2x+7y=-8}} \right. \\\\\left \{ {{x=-\frac{-2y-13}{3}} \atop {2\left(-\frac{-2y-13}{3}\right)+7y=-8}} \right. \\\\\left \{ {{x=-\frac{-2y-13}{3}} \atop {\frac{25y+26}{3}=-8}} \right. \\\\\left \{ {{x=-\frac{-2y-13}{3}} \atop {y=-2}} \right. \\\\\left \{ {{x=-\frac{-2\left(-2\right)-13}{3}} \atop {y=-2}} \right. \\\\\left \{ {{x=3} \atop {y=-2}} \right.[/tex]
e)
[tex]\left \{ {{x+2\left(y-3\right)=-6} \atop {\:3x-2\left(x-y\right)=4}} \right. \\\\0=4\\[/tex]
indefinit
