Question

The solution of the system x+ y - 3z = -6, -7y+7z = 7, 3z=9 is
(A)x=1, y=2, z=3 (B) x=-1, y=2, z=3
(C)x= -1, y= -2, z=3 (D) x=1, y=-2, z=3​

Answer 1

Answer:

A) x=1,y=2,z=3

Step-by-step explanation:

3z=9

z=9/3

z=3

-7y+7z=7

-7y+7(3)=7

-7y+21=7

-7y=7-21

-7y= -14

y = 14/7

y=2

x+y-3z= -6

x+(2)-3(3)= -6

x+2-9= -6

x+-7= -6

x= -6+7

x= 1