Question 711837
{{{ ( x[K] + x[L] ) / 2 = -8 }}}
{{{ x[K] = -6 }}}, so
{{{ ( -6 + x[L] ) / 2 = -8 }}}
{{{ -6 + x[L] = -16 }}}
{{{ x[L] = -10 }}}
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{{{ ( y[K] + y[L] ) / 2 = 1 }}}
{{{ y[K] = 5 }}}
{{{ ( 5 + y[L] ) / 2 = 1 }}} 
{{{ 5 + y[L] = 2 }}}
{{{ y[L] = -3 }}}
The coordinates of endpoint L are L(-10, -3)