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x - 8y + z = 2
x - 4y + 7z = 7
x + 2y - z = 2

X - 8y + z = 2 multiply by -1
x - 4y + 7z = 7

-x + 8y - z = -2 (result of multiplying by -1)
x - 4y + 7z = 7
add
4y + 6z = 5

x - 4y + 7z = 7
x + 2y - z = 2multiply by -1

x - 4y + 7z = 7
-x - 2y + z = -2 (result of multiplying by -1)
add
-6y + 8z = 5

4y + 6z = 5multiply by 3
-6y + 8z = 5...multiply by 2

12y + 18z = 15 (result of multiplying by 3)
-12y + 16z = 10 (result of multiplying by 2)
add
34z = 25
z = 25/34

4y + 6z = 5
4y + 6(25/34) = 5
4y + 150/34 = 5
4y = -150/34 + 5
4y = -150/34 + 170/34
4y = 20/34
y = 20/136 reduces to 5/34

x - 8y + z = 2
x - 8(5/34) + 25/34 = 2
x - 40/34 + 25/34 = 2
x - 15/34 = 2
x = 2 + 15/34
x = 68/34 + 15/34
x = 83/34

so x = 83/34, y = 5/34, and z = 25/34 <

Basic algebra equation. first set up your equation: divide out 9.and now you are left with 2x + 4 = 8.