The equation which represents the relationship between neighbor's price and regular price is "r - n = 2.50".
Linear equation in two variables:
Any equation which can be put in the form ax + by + c = 0, where a, b and c are real numbers, and a and b are not both zero.
According to the given question
Khalid raises bees and sells the honey.
And, r denotes the regular price of honey in dollars and n denotes the neighbor's price of honey in dollars.
From the given data we can calculate the discount
7 - 4.50 = 2.50
8 - 5.50 = 2.50
10 - 7.50 = 2.50
12 - 9.50 = 2.50
⇒ Khalid giving $2.50 to his neighbor's.
Therefore, the equation that represent the relationship between regular price r and neighbor's price n will be
r - n = 2.50. (which is the linear equation in two variables.)
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