Question 436746
 {{{ log ( 4, a ) + log ( 4, 9 ) = log ( 4, 27 )}}}
{{{ log(4, 9a) = log(4,27) }}}
{{{ 9a = 27 }}}
{{{ a = 3 }}}
--------
{{{ log ( 2, y+2 ) - log ( 2, y-2 ) = 1 }}}
Note that {{{ log(2,2) = 1}}}
{{{ log(2,y+2) = log(2,y-2) + log(2,2) }}}
{{{ log(2,y+2) = log(2,2*(y-2)) }}}
{{{ y + 2 = 2*(y-2) }}}
{{{ y + 2 = 2y - 4 }}}
{{{ y = 6 }}}
check answer:
{{{ log ( 2, y+2 ) - log ( 2, y-2 ) = 1 }}}
{{{ log ( 2, 6+2 ) - log ( 2, 6-2 ) = 1 }}}
{{{ log ( 2, 8 ) - log ( 2, 4 ) = 1 }}}
{{{ log ( 2, 2^3 ) - log ( 2, 2^2 ) = 1 }}}
{{{ 3 - 2 = 1 }}}
{{{ 1 =1 }}}
OK