Question 1050581
Use general point-slope formula
{{{ ( y -(-1) ) / ( x - 3 ) = -2 }}}
{{{ ( y + 1 ) / ( x - 3 ) = -2 }}}
{{{ y + 1 = -2*( x-3 ) }}}
{{{ y + 1 = -2x + 6 }}}
{{{ y = -2x + 5 }}}
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check:
does it go through ( 3,-1 )
{{{ -1 = -2*3 + 5 }}}
{{{ -1 = -6 + 5 }}}
{{{ -1 = -1 }}}
OK