Question 1101065
slope = [ change in y ] / [ change in x ]
{{{ ( y - 3 ) / ( -7 - 9 ) = -3/13 }}}
{{{ ( y - 3 ) / (-16) = -3/13 }}}
Multiply both sides by {{{ -13*16 = -208 }}}
{{{ 13*( y - 3 ) = 3*16 }}}
{{{ 13y - 39 = 48 }}}
{{{ 13y = 87 }}}
{{{ y = 87/13 }}}
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check:
{{{ ( y - 3 ) / (-16) = -3/13 }}}
{{{ ( 87/13 - 39/13 ) / (-16) = -3/13 }}}
{{{ 48/13 = ( 16*3 )/13 }}}
{{{ 48/13 = 48/13 }}}
OK