3.2 part 1 notes

# 3.2 part 1 notes - 7 2 4 3 4 y x y x 2 You try 1 2-= =-12 6...

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1 3.2 Notes (part 1) Solving Systems Algebraically Warm-up Substitute 2y – 1 for x in each equation. Solve for y. 1) x + 2y = 3 2) 2y + 3x = -5 Objectives solve a system using substitution translate word problems into a system and solve Solving By Substitution: Must follow a series of steps to solve. .. = - = + 7 2 4 3 4 y x y x Solving by Substitution Here is a system Step 1: Solve for one of the variables. Solving the second equation for y is easiest. = - = + 7 2 4 3 4 y x y x Solving by Substitution y = 2x -7 Step 2: Substitute the expression for y into the other equation. Solve for x. = - = + 7 2 4 3 4 y x y x Solving by Substitution x = 2.5 Step 3: Substitute the value of x into either equation. Solve for y. Answer: (2.5, -2) = - = +

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Unformatted text preview: 7 2 4 3 4 y x y x 2 You try! 1) 2) -= + =-12 6 3 2 y x y x = + =-26 3 4 3 y x y x Word Problem 1) The cost of membership in a health club includes a monthly charge and a one-time initiation fee. Find the monthly charge and initiation fee if the club costs a total of \$100 for 2 months or \$200 for 6 months. Word Problem 2) You can buy CDs at a local store for \$15.49 each. You can buy them at an online store for \$13.99 plus \$6 for shipping. Solve a system of equations to find the number of CDs that you can buy for the same amount at the two stores. Homework p. 126 # 1-13, 15...
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3.2 part 1 notes - 7 2 4 3 4 y x y x 2 You try 1 2-= =-12 6...

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