Question 639957
Is {{{y}}} on the bottom or the top of the fraction ?
If it's on the top, you have:
{{{ (2/5)*y = 4/5 }}}
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The rule is: Whatever you do to one side of the
equals sign, you must do to the other side, and the 
equation will still be true.
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First multiply both sides by {{{5}}}
Then what you have is:
{{{ (5/5)*2y = (5/5)*4 }}}
{{{ 2y = 4 }}}
Divide both sides by {{{ 2 }}}
{{{ (2/2)*y = 4/2 }}}
{{{ y = 2 }}} answer
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Now if the {{{y}}} is on the bottom of the fraction,
Multiply both sides by {{{5}}} also
{{{ (5/5)*(2/y) = (5/5)*4 }}}
{{{ 2/y = 4 }}}
Now multiply both sides by {{{y}}}
{{{ (y/y)*2 = 4y }}}
{{{ 2 = 4y }}}
Divide both sides by {{{4}}}
{{{ y = 2/4 }}}
{{{ y = 1/2 }}}
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Hope this helps