Your local gas stations are having a price war. During the past 7 days they have lowered the price of regular gas by $.02 each day How do you write and solve an equation to find the total change in gas price?

Question

5424 views around the world

You can reuse this answer
Creative Commons License

Answer 1 · 2017-07-31T16:57:49

See a solution process below:

Let's let:

#t# be the total change in the price of gas, what we are solving for in this problem.

#d# be the number of days the prices has decreased. 7 for this problem.

#c# be the change in price each day. -$0.02 for this problem (the price has been lowered so this number is negative).

The formula will be:

#t = d * c#

Substituting and calculating #t# gives:

#t = 7 * -$0.02$

#t = -$0.14$#

Over the last 7 days the price of gas has changed #color(red)(-$0.14)#