Answer
The second equation must be multiplied by $2$, which will produce a new system:
$4x + 2y = -7$
$6x - 2y = -24$.
Work Step by Step
To eliminate $y$, the coefficients of $y$ must be the same for both equations, except one equation should have a positive value and the other equation should have a negative value. The coefficient of $y$ of the first equation is 2, so the coefficient of $y$ of the second equation must be made into $-2$ in order to use the addition method. The current coefficient of $y$ of the second equation is $-1$, so the second equation must be multiplied by $2$.
$4x + 2y = -7$
$6x - 2y = -24$
