Tina Z. answered • 10/28/15
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If you are working with the system 4x+y=12 and y=2x, then you can begin by substituting the second equation (2x) back into the first equation (instead of y).
This would give you 4x+2x=12 which you would then solve for x. Combine like terms to get 6x=12, divide both sides by 6 so that x=2.
Once you know that x=2, substitute 2 for x into the second equation. y=2(2+ so y=4.
The ordered pair would be (2, 4).
