Answer: 24 necklaces
Step-by-step explanation:
y=240+2x is the amount she spends
y=12x is the amount she makes
If the amount she spent = the amount she makes then she break even
240+2x=12x
240=12x-2x
240=10x
So x = 240/10=24 necklaces she needs to sell to break even
Answer is 24 necklaces
Hope this helps!!! Good luck!!! ;)