Question

se {x+2y+3z=14 , determine o valor de x.
7y+5z=23
3z=18

Answer 1

 3z =18
 z=18/3
 z=6

7y+5z=23
7y= 23 - 5 (6)
7y= 23 - 30
7y=-7
 y=-1

x+2Y+3Z=14
X+2(-1)+3(6)=14
X-2+18=14
X+16=14
x=-2