Question

Solve for z:

x+2y+x= 4
x+2z=3
-y-4z=-5

Answer 1

is the 1st one = x + 2y + x =4 or x + 2y +z = 4

Answer 2

ah, so sorry the first one is x+2y+ Z

Answer 3

Hi,
then
let's number the equations first,
x + 2y + z = 4 ---(1)
x + 2z = 3 ---(2)
-y - 4z = -5 ---(3)

let's multiply (3) by -2
2y + 8z = 10 ---(4)

(2) + (4)
x + 2y + 10z =13 ---(5)

(5) - (1)
9z = 9
z = 1

hope this will help u out