Your local gas stations are having a price war. during the past 7 days they have lowered the price of regular gas by $0.2 each day. define a variable. then write and solve an equation to find the total change in gas price.

Let the previous price of the gas be represented by = x

Let the current price of the gas be represented by = y

As given, during the past 7 days they have lowered the price of regular gas by $0.2 each day.

This means after 7 days the price has been lowered by = $1.4

Equation becomes:

So, total change in the price in 7 days is $1.4 less than the previous amount.

to determine the unit cost your would divide the total cost by the number sold.

7 bagels for $4.41       $4.41/7 = $.63 each at fresh side

5 bagels for $3.60         $3.60/5 = $.72 each at value mart