Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Solving Equations & Inequalities Word Problems Objectives: •To solve word problems involving linear equations and inequalities. VOCAB OF WORD PROBLEMS ADDITION SUBTRACTION SUM MORE THAN PLUS INCREASED BY DIFFERENCE LESS THAN MINUS DECREASED BY MULTIPLICATION PRODUCT TIMES MULTIPLIED BY PER DIVISION QUOTIENT DIVIDED BY VOCAB OF WORD PROBLEMS WORD IS/ARE IS LESS THAN OPERATION = < IS GREATER THAN IS LESS THAN OR EQUAL TO IS GREATER THAN OR EQUAL TO QUANTITY A NUMBER > ≤ OPPOSITE OF A NUMBER ≥ ( ) X -X Write & solve an inequality. Label each step (DCMAM) 1) Three times a number n decreased by two is less than or equal to five times a number n. 3n 2 5n 3n 3n 2 2n 2 2 1 n n 1 Move the variable to one side M – Divide by the coefficient Write & solve an inequality. Label each step (DCMAM) 2) Three times the sum of a number x and two is less than twice a number x increased by 6. 3 x 2 2x 6 Distribute 3x 6 2x 6 Move the variable to 2 x 2x one side x6 6 A – Subtract the 6 6 constant x0 Write & solve an inequality. Label each step (DCMAM) 3) Four times a number n decreased by 7 is greater than or equal to five times the sum of twice a number n and seven. Distribute Move the variable to one side A – Subtract the constant 4n 7 5( 2n 7) 4n 7 10n 35 4n 4n 7 6n 35 35 35 42 6n M – Divide by the coefficient 6 6 n 7 7 n Write & solve an inequality. 4) A manufacturer of remote-control race cars sells them for $18 each. The cost to run the company is $2,000 per day plus $13 to build each car. What is the minimum number of cars that must be sold each day for the company to make a profit? Variable Key info Word Let C = minimum # of cars that must be sold to make a profit Income > expenses equation Numeric 18c 2000 13c equation Solve 18c 2000 13c 13c 13c 5c 2000 5 5 c 400 They must sell more than 400 cars to make a profit. That means, at least 401 cars. Write & solve an inequality. 5) A store charges $4 per game to rent a video game. A club charges only $2 per game, but has a membership fee of $50 per year. At least how many games must you rent each year so that renting from the club costs less than renting from the store? Variable Key info Word Let g = minimum # of games you need to rent each year to make renting from club less than the store Club cost < store cost equation Numeric equation 2 g 50 4 g Solve 2 g 50 4 g 2g 2g 50 2 g 2 2 25 g g 25 You must rent more than 25 games to make the club costs less than the store cost. That means, at least 26 games.