Chapter 7.2 Notes: Solve Linear Systems by Substitution

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Chapter 7.2 Notes: Solve Linear Systems by Substitution Goal: You will solve systems of linear equations by using substitution.

Solving a Linear System Using the Substitution Method: Step 1: Solve one of the equations for one of its variables. When possible, solve for a variable that has a coefficient of 1 or -1. Step 2: Substitute the expression from Step 1 into the other equation and solve for the other variable. Step 3: Substitute the value from Step 2 into the revised equation from Step 1 and solve.

Solve each system of linear equations by substitution Solve each system of linear equations by substitution. Then check your solution. Ex.1: Ex.2: Ex.3: Ex.4: Ex.5: Ex.6:

Ex. 7: Ex. 8: The sum of two numbers is 35 Ex.7: Ex.8: The sum of two numbers is 35. The first number is four times the second number. Find the numbers. Ex.9: During a football game, students sell drinks and popcorn. They charge $2.50 for a bag of popcorn and $2 for a drink. The students collect $336 in sales. They sell twice as many bags of popcorn as drinks. How many bags of popcorn do they sell?

Ex.10: You have twice as many apples as oranges, and you have 12 apples and oranges altogether. How many apples and oranges do you have? Ex.11: A group of friends take a day-long tubing trip. The rental shop charges $15 to rent a tube for a person and $7.50 to rent a “cooler” tube, which is used to carry food in a cooler. The friends spend $360 to rent a total of 26 tubes. How many of each type of tubes do they rent?