Please help me with the question posted in the photo.

B

Step-by-step explanation: Let me know if you need an explanation.

B

Step-by-step explanation:

let's consider equation 1 and 3

1 -3

2x+2y+7z- (5x+2y+4z)= 9-9

2x+2y+7z-5x-2y-4z= 0

3z-3x = 0

divide while equation by 3

z-x=0

therefore z= x

now let's check equation 1 and 2

1-2

2x+2y+7z -(2x+6y+5z) =9-7

2x+2y+7z- 2x- 6y- 5z= 2

2z- 4y= 2

so z- 2y= 1

z-1=2y

from the given answers check which answers have same value for x and z

answer should be a or b

now check with the derived equation z-1=2y

for answer a

z-1=2y

3-1= 2×(-2)

2 = (-4)

so it's not the answer

for answer b

z-1=2y

1-1=2×0

0=0

yes this is the correct one

hope you get this:D

answer: 59

step-by-step explanation:

d

step-by-step explanation: