Consider this system of linear equations:
22x − y = -23 (equation 1)
11x + 12y = 1 (equation 2)
to find the value of x, you need to substitute x = (y - 23)/22 x = (y + 23)/22 y = 22x + 23 y = 22x - 23 in equation 2.
the value of x is -1 22/23 1 2 .

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?

Damon makes 20 cups of lemonade by mixing lemon juice and water. the ratio of lemon juice to water is shown in the tape diagram. lemon juice\text{lemon juice} lemon juice water\text{water} water how much lemon juice did damon use in the lemonade? cups

Acompany made a profit of 75000 over a period of 6 years on an initial investment of 15000 what is the annual roi