Question

X + Y + 2z = 1

Y - Z = 4

7z = 21

Answer 1

Explicação passo-a-passo:

7z= 21

z= 21/7

z= 3

y-z= 4

y- 3= 4

y= 4+3

y= 7

x + y + 2z= 1

x + 7 + 2.3= 1

x+ 7 +6 = 1

x+ 13= 1

x= 1-13

x= - 12