Answer
You sell 26 necklaces and 12 bracelets.
Work Step by Step
We have:
$3.5x+2.5y=121$
$9x+7.5y=324$
Multiply both sides of the first equation by $-3$:
$-10.5x-7.5y=-363$
$9x+7.5y=324$
____________________________
$-1.5x=-39$
$x=26$
Substitute for y in the first equation:
$3.5(26)+2.5y=121$
$2.5y=30$
$y=12$
You sell 26 necklaces and 12 bracelets.
