Question

Quem puder me ajudar por gentileza, eu agradeço!

Answer 1

x+2y+z=7

x=7−2⁢y−z

y=y

z=z

2

2x+7y+z=21

2x=21−7⁢y−z

x=21/2−7/,2⋅y−1/2⋅z

y=y

z=z

3

-3x-5y+2z=-8

-3x=-8+5⁢y−2⁢z

x=8/3−5/3⋅y+2/3⋅z

y=y

z=z