Question

Help! I need help getting rid of the y
http://oi60.tinypic.com/244y5xz.jpg

Answer 1

well how do u think u should do it @Nerdy_3000

Answer 2

I'm obviously very confused! I was trying to subtract the y from the other equation but it still doesn't make any sense

Answer 3

you have to fill y x and z in with annumber and ur answer has to be 4

Answer 4

Is the number 2 that I have to fill in

Answer 5

perfect yes

Answer 6

\(\large \begin{array}{llll}
x-y+2z=4\implies &x-y+2z=4\\
x-3z=1\implies &x{\color{blue}{ +0y}}-3z=1\\
2y-z=-15\implies &{\color{blue}{ 0x}}+2y-z=-15
\end{array}\)

Answer 7

x-y+2z=4 ...(1)
x-3z=1 ...(2)
2y-z=-15 ...(3)
multiply (1) by 2 and add in (3)
2x+3z=-7 ...(4)
solve (2) and (4) to get x and z.
then put in (3) or (1) to get the value of y.