\left \{ {{x+4y=-2} \atop {3x-8y=10}} \right.
\left \{ {{x=-2-4y} \atop {3(-2-4y)-8y=10}} \right.
\left \{ {{x=-2-4y} \atop {-6-12y-8y=10}} \right.
\left \{ {{x=-2-4y} \atop {-20y=10+6}} \right.
\left \{ {{x=-2-4y} \atop {-20y=16}} \right.
\left \{ {{x=-2-4y} \atop {y=-0,8}} \right.
\left \{ {{x=-2-4*(-0,8)} \atop {y=-0,8}} \right.
\left \{ {{x=-2+3,2} \atop {y=-0,8}} \right.
\left \{ {{x=1,2} \atop {y=-0,8}} \right.