Question 1053551
Let {{{ a }}} = number of new releases downloaded
Let {{{ b }}} = number of older songs downloaded
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(1) {{{ a + b = 33 }}}
(2) {{{ 1.29a + .99b = 35.97 }}}
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(2) {{{ 129a + 99b = 3597 }}}
Multiply both sides of (1) by {{{ 99 }}}
and subtract (1) from (2)
(2) {{{ 129a + 99b = 3597 }}}
(1) {{{ -99a - 99b = -3267 }}}
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{{{ 30a = 330 }}}
{{{ a = 11 }}}
and
(1) {{{ a + b = 33 }}}
(1) {{{ 11 + b = 33 }}}
(1) {{{ b = 22 }}}
He bought 11 new releases
He bought 22 older songs
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I don't know what the echelon method is,
but this is the way I do it.