Question 899030
You're on the right track but made some mistakes.
{{{4x-y=3}}}
{{{-4x-6y=-38}}}
Now adding them,
{{{4x-y-4x-6y=3-38}}}
{{{-7y=-35}}}
{{{y=(-35)/(-7)}}}
{{{y=5}}}
Now plug in the value for {{{y}}} into either equation and solve for {{{x}}}.