Question

Resolva sistema linear
x+2y+z=7
2x+7y+z=21
-3x-5y+2z=-8

Answer 1

x+2y+z=7  x(-1)
2x+7y +z= 21
___________
-x -2y -z=-7
2x+7x+z=21
x+5y =14

2x+7x+z=21 x(-2)
-3x-5y+2z=-8
___________
-4x-14x-2z=-42
-3x-5y+2z=-8
__________
-7x-19y=-50

x+5y =14 x(7)
-7x-19y=-50
_________
7x+35y =98
-7x-19y=-50
16y = 48
y=48/16=3
o valor de x
x+5y=14
x+5.3=14
x= 14-15=-1
o valor de z
x+2.3+z=7
-1 +6 +z=7
5+z=7
z=7-5=2