Question

11x+3z=9,2x+2y+z=8,2x-6y+4z=5

Answer 1

①11x+3z=9,②2x+2y+z=8,③2x-6y+4z=5把Z=3-11/3X带入②③②2X+2Y+3-11/3X=8 2Y-5/3X=5 ③2X-6Y+4{3-11/3X}=5 6Y+38/3X=7 把Y=2.5+5/6X带入③ 6｛2.5+5/6X｝+38/3X=7 15+53/3X=7 x=-24/53 把 x=-24/53带入 ① 11{-24/53}+3z=9 3Z=741/53 Z=247/53把x=-24/53 带入③ 6Y+38/3｛-24/53 ｝=7 6Y=599/53 Y=318/599x=-24/53 Z=247/53 Y=318/599

Answer 2

2x+2y+z=8整个式子乘3.然后与2x-6y+4z=5相加，消去Y。再与11x+3z=9联立解得x,y.代入2x-6y+4z=5解得z

Answer 3

x= - 24/53y=225/106z=247/53

Answer 4

x=3 y=-8 z =5