Which equation shows the substitution method being used to solve the system of linear equations?

x – y = 7
x = y + 3

a.
(y + 3) – y = 7

b.
x = (7 – x) + 3

c.
x – (y + 3) = 7

d.
x – y = y + 3

Aschool typically sells 500 yearbooks each year for 50 dollars each. the economic calls does a project and discovers that they can sell 100 more yearbooks for every $5 decrease in price. the revenue for yearbook sales is equal to the number of yearbooks sold times the price of the yearbook. let x represent the number of $5 decrease in price. if the expression that represents the revenue is written in the form r(x)=(500+ax)(50-bx). to maximize profit, what price should the school charge for the yearbooks? what is the possible maximum revenue? if the school attains the maximum revenue, how many yearbooks will they sell?

Eileen purchased 3.4 pounds of apples at the total cost of $19.72. if she purchases 6.2 pounds of apples at this store, how much would it cost?

Acircle has a circumference of 28.36 units what is the diameter of the circle