Question 719878
{{{ ( y - 1 ) / ( x -(-4) ) = ( 16 - 1 ) / ( 0 -(-4) ) }}}
{{{ ( y - 1 ) / ( x + 4 ) = 15 / 4 }}}
Multiply both sides by {{{ 4*( x+4 ) }}}
{{{ 4*( y - 1) = 15*( x + 4 ) }}}
{{{ 4y - 4 = 15x + 60 }}}
{{{ 4y = 15x + 64 }}}
{{{ y = ( 15/4 )*x + 16 }}}
check:
( -4,1 )
{{{ y = ( 15/4 )*x + 16 }}}
{{{ 1 = ( 15/4 )*(-4) + 16 }}}
{{{ 1 = -15 + 16 }}}
{{{ 1 = 1 }}}
( 0,16 )
{{{ y = ( 15/4 )*x + 16 }}}
{{{ 16 = ( 15/4 )*0 + 16 }}}
{{{ 16 = 16 }}}
OK