Question

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.

Answer 1

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

`0.2*7=1.4`

Equation becomes:

`y=x-1.4`

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