Question 691610
The format of (6,11) is (x,y), so
{{{ x = 6 }}}
{{{ y = 11 }}}
plug these into the given equation
{{{ y = 13x - 12 }}}
{{{ 11 = 13*6 - 12 }}}
{{{ 11 = 78 - 12 }}}
{{{ 23 = 78 }}} 
Not true, so the given point is not a solution of
{{{ y = 13x - 12 }}}