Question

Hi, I need help on this ? plz..


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

answer choice:
A. x = -4, y = 3, z = 6
B. x = 4, y = -3, z = 2
C. x = 8, y = -3, z = 2
D. x = 4, y = 3, z = 2
help:3

Answer 1

start at the bottom
if \(2a=4\) then what is \(z\) ?

Answer 2

2?

Answer 3

lol sorry, i meant \(2z=4\)
yes \(z=2\)

Answer 4

Then wat do i do ? :O

Answer 5

second equation is
\[5y-4z=7\] and if \(z=2\) then it is
\[5y-4\times 2=7\] or
\[5y-8=7\]

Answer 6

if \(5y-8=7\) then what is \(y\) ?

Answer 7

How can i find the y ? do i add 8 both sides ??

Answer 8

yes

Answer 9

add 8 to both sides, then divide by 5

Answer 10

3 ?

Answer 11

(:

Answer 12

yup

Answer 13

which pretty much only leaves one answer, but you can find \(x\) using the first equation

Answer 14

wait, what i got confused ?

Answer 15

please explain ? (:

Answer 16

we have \(z=2,y=3\) and your answer choices only have one with these
but you can put
\[x-2y+z=0
\\x-2\times 3+2=0\\x-6+2=0
\\x-4=0\] and solve for \(x\)

Answer 17

4 ? @satellite73

Answer 18

(: