your local gas stations are having a price war. During the past 7 days they have lowerd the price of regular gas by $.02 each day

Define as a variable then solve and the equation

well, you will involve -0.02d

where d is the number of days.
But you haven't said just what it is you want to solve.

Let's define "x" as the number of days since the start of the price war, and "y" as the price of regular gas on the xth day. The initial price of regular gas can be defined as "y0". We can then represent the equation as:

y = y0 - 0.02x

To solve this equation, we need more information. If you provide the initial price (y0) or the price on a specific day, I can assist you further in finding the solution.

To define the equation and solve it, let's assign some variables:

Let's say the initial price of regular gas is represented by P (in dollars).
The number of days of the price war is represented by D.
The daily decrease in price is represented by R (in dollars).

Based on the given information, we know that the price decreases by $0.02 each day. Therefore, R = 0.02.

Now, we can define the equation for the price of regular gas (G) on each day:

G = P - (D * R)

In this equation, P is the initial price, D is the number of days of the price war, and R is the daily decrease.

To solve the equation, we need the initial price (P) and the number of days of the price war (D). If you provide those values, I can calculate the price of regular gas after the specified number of days.