Question 443872
{{{ ( y - (-1) ) / ( x - 2 ) = ( 3 -(-1)) / ( -2 - 2 ) }}}
{{{ ( y + 1 ) / ( x - 2 ) = ( 3 + 1) / ( -4 ) }}}
{{{ ( y + 1 ) / ( x - 2 ) = 4 / ( -4 ) }}}
{{{ ( y + 1 ) / ( x - 2 ) = -1 }}}
{{{ y + 1 = -x + 2 }}}
{{{ y = -x + 1 }}}
check answer:
(-2,3)
{{{ y = -x + 1 }}}
{{{ 3 = -(-2) + 1 }}}
{{{ 3 = 2 + 1 }}}
{{{ 3 = 3 }}}
and
(2,-1)
{{{ -1 = -2 + 1 }}}
{{{ -1 = -1 }}}
OK