Mini-Lesson 5. Section 5.1: Algebraic Equations
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1 Mini-Lesson 5 Section 5.1: Algebraic Equations DEFINITION: An algebraic equation is a mathematical sentence connecting one expression to another expression with an equal sign (=). Verify that a given value is a solution to an equation DEFINITION: The solution to an equation is the value, or values, that makes the equation true. Example 1: Verify that x = -3 is a solution to the algebraic equation. Example 2: Is m = -1 a solution to the algebraic equation? Example 3: Is a = 5 a solution to the algebraic equation ( ) ( )?
2 Equivalent Equations DEFINITION: Equivalent equations are two or more equations that have the same solution. Example 4: Verify that x = 2 is a solution to the following equations. YOU TRY 1. Verify that p = -9 is a solution to the algebraic equation 2. Is x = 2 is a solution to the algebraic equation 2(5x 12) = 1 5(x 1)?
3 Section 5.2: Solving One-Step Equations Properties of Equality The Addition/Subtraction Property of Equality: If then If then The Multiplication/Division Property of Equality: If then. If Solving an Equation DEFINITION: To solve an equation means to undo all the operations of the equation, leaving the variable by itself on one side. This in known as isolating the variable. Solve for the variable in each of the following equations. Check your answers. Example 1: Example 2: Example 3: Example 4: Example 5: Example 6:
4 Example 7: Example 8: YOU TRY 3. Solve for the variable in each equation and check your answer. Show all steps as in the MiniLesson examples. a. b. c. d.
5 Section 5.3: Solving Two-Step Equations STEPS FOR SOLVING A LINEAR TWO-STEP EQUATION 1. Apply the Addition/Subtraction Property of Equality. 2. Apply the Multiplication/Division Property of Equality to isolate the variable. 3. Check by substituting your answer into the original equation. Solve for the variable in each of the following equations. Check your answers. Example 1: Solve: Check: Example 2: Solve: Check: Example 3: Solve: Check: Example 4: Solve: Check:
6 Example 5: Solve: Check: YOU TRY 4. Solve for the variable in each equation and check your answer. Show all steps as in the MiniLesson examples. a. Solve: Check: b. Solve: Check: c. Solve: Check:
7 Section 5.4: Solving Multi-Step Equations STEPS FOR SOLVING A LINEAR EQUATION 1. Simplify each side of the equation. Remove parenthesis if necessary. Collect like terms. 2. Add or subtract terms on each side of the equation so that all terms containing the variable are on one side and all constant terms are on the other side. 3. Simplify each side of the equation by combining like terms. 4. Apply the Multiplication/Division Property of Equality to isolate the variable. 5. Check by substituting the solution into the original equation. Solve for the variable in each of the following equations. Check your answers. Example 1: Solve Check Example 2: Solve ( ) ( ) Check
8 Example 3: Solve ( ) ( ) Check: YOU TRY 5. Solve for the variable in each equation and check your answer. Show all steps as in the MiniLesson examples. a. Solve Check: b. Solve ( ) ( ) Check:
9 Section 5.5: Solving Equations Applications For this type of problem, first determine the Givens and the Goal, then form a Strategy, Solve, and Check. Write your answer in a complete sentence. Example 1: The maximum heart rate is the highest heart rate achieved during maximal exercise. In general, you gain the most benefits and lessen the risks when you exercise within your target heart rate zone. Usually this is when your exercise heart rate (pulse) is about 70% percent of your maximum heart rate. The formula T = 0.7(220 a), gives the target heart rate, T, in beats per minute, for a person who is a years of age. Determine the age of a person whose target heart rate is 135 beats per minute. GIVEN: GOAL: STRATEGY: SOLUTION: CHECK: FINAL RESULT AS A COMPLETE SENTENCE:
10 YOU TRY For this problem, identify the Givens the Goal. Form a strategy, solve, check, and write your answer in a complete sentence. 6. The cost of tuition at a local community college is given by the equation C 76n, where C represents the total cost of tuition and n represents the number of credits taken. If you have $800 dollars to spend on tuition, how many credits can you take? GIVEN: GOAL: STRATEGY: SOLUTION: CHECK: FINAL RESULT AS A COMPLETE SENTENCE:
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