Question

Help please!

Answer 1

you gotta write them all first a \[ax+by+cz=d\] i.e. in order from x to y to z

Answer 2

the first line is already in that order, but the other two are not

Answer 3

2x+y+2z=7
4x+y+z=-1
Is that want you mean?

Answer 4

is it B?

Answer 5

yes, that is the order you need to put them in
then you can read off the answer from that

Answer 6

and yes, it is B