Answer:
The number of units decreased by 
.
Step-by-step explanation:
Initially, 470 units were sold. The following 429 units were sold, meaning this was 
less units than last year. Thus, the number of units sold decreased and the percent of decrease is:
The decimal for 1/2 is 0.5
The other number could be any number that isn't an even number. For instance: 1,3,5,7,9,11,13,15,17... (you get it)
I hope this helps you
x=-1/2 y
-1/2 y -3/2 y=4
-1-3/2 y=4
-4/2 y=4
y= -2
x= -1/2. (-2)
x= 1
