ANSWER
The correct answer is C [tex] x=3[/tex].
EXPLANATION
We have
[tex]4x+2y=12---(1)[/tex]
and
[tex]x-y=3---(2)[/tex].
We solve the two equation simultaneously by elimination method. We need to be smart and eliminate y, since we are looking for [tex]x[/tex].
We first multiply equation (2) by 2
[tex]2x-2y=6---(3)[/tex].
We add equation (3) and (1).
[tex]\Rightarrow 6x=18 [/tex].
Dividing through by 6 gives
[tex]x=3[/tex].
