Question

https://gyazo.com/616ad1bc3d0dd8f1db00314bf5e73923

Answer 1

manipulate each of the 4 options to see if you can change them to x = 2y + z

for example the first one:-
x - 2y = z
add 2y to both sides
x - 2y + 2y = 2y + z
x = 2y + z

you have obtained the equation in the question so its not the first option

Answer 2

sorry i was in the bathroom

Answer 3

thats ok

do you follow the above ?

Answer 4

we are trying to convert each option to x = 2y + z
to see which one is not equivalent to it.

Answer 5

start with A? the elimnation process

Answer 6

yes I've done A for you
A is equivalent to x = 2y + z

Answer 7

B is x - z = 2y

now add z to each side of the equations.

Answer 8

what do you get?

Answer 9

u left