Ответ:

z = 18

y = 8

Объяснение:

[tex]\left \{ {{z=10+y} \atop {z-2y+2=4}} \right. \\\\\left \{ {{z=10+y} \atop {z-2y=2}} \right. \\\\z=10+y\\10+y-2y=2\\-y=2-10\\-y=-8\\y=8\\z=10+8\\z=18[/tex]