Answer:
y = 2x - 4
x = R
Step-by-step explanation:
[tex]\left \{ {{2x - y = 4} \atop {4x - 2y = 8}} \right.[/tex]
1)
2x - y = 4
-y = -2x + 4
y = 2x - 4
2) to find x
replace y by 2x - 4 in the second equation
4x -2y = 8
4x -2(2x-4) = 8
4x -4x +8 = 8
4x -4x = 8-8
4x -4x = 0
0 = 0 ⇒ any number is possible for x
