Question 125832
You're almost there
{{{ 3x + 7y = -1}}}
{{{-6x - 7y = 0}}}
In the 2nd equation, you subtracted {{{7y}}} from both sides, and
that left {{{0}}} on one side as you can see
Now just add the 2 equations
{{{-3x = -1}}}
{{{x = 1/3}}}
substitute this answer in either equation to find {{{y}}}
{{{-6(1/3) - 7y = 0}}}
{{{-2 - 7y = 0}}}
{{{7y = -2}}}
{{{y = -(2/7)}}}
check:
{{{ 3x + 7y = -1}}}
{{{-6x - 7y = 0}}}
{{{3(1/3) + 7(-(2/7)) = -1}}}
{{{1 - 2 = -1}}}
{{{-1 = -1}}}
OK
and you can check other one