Question 1106191
Let {{{ a }}} = the cost of a single new CD
Let {{{ b }}} = the cost of a single used CD
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(1) {{{ 6a + 2b  = 127.92 }}}
(2) {{{ 3a + 8b = 133.98 }}}
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Multiply both sides of (1) by {{{ 4 }}}
and subtract (2) from (1)
You can finish