I need help with this it’s confusing

Given the system of equations presented here: 2x + 4y = 14 4x + y = 20 which of the following actions creates an equivalent system such that, when combined with the other equation, one of the variables is eliminated? multiply the second equation by â’4 to get â’16x â’ 4y = â’80 multiply the second equation by â’1 to get â’4x â’ y = â’20 multiply the first equation by 2 to get 4x + 8y = 28 multiply the first equation by â’1 to get â’2x â’ 4y = â’14

X-10/4 when x = –18 a 7 b –2 c –7 d 2

Which answer choice is it? is it the first ,second,third or fourth giving 40 points for whoever answers correctly you