The equation is 
Step-by-step explanation:
The bracket is denoted by the variable x.
The necklace is denoted by the variable y.
From given, Linda sells her bracket for $6.
Thus, the expression for bracket is
.
Also, Linda sells her necklace for $10.
Thus, the expression for necklace is
.
The equation for Linda sells her bracket and necklace is 
Greater than is your answer
Answer:
-40%
Step-by-step explanation:
NV = new value
OV = old value
percent change = (NV - OV)/(OV) × 100%
percent change = (30 - 50)/(50) × 100%
percent change = -20/50 × 100%
percent change = -40%