Step-by-step explanation:
I dont either tbh
Y=250+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
250+2x=12x
250=12x-2x
250=10x
So x = 250/10=25 necklaces she needs to sell to break even
Answer is 25 necklaces
I can only guess that you meant to write
12 + 3 = 3 + 12
which would be the commutative property of addition.