S4_3_Equations_Inequations_Ch5

# S4_3_Equations_Inequations_Ch5 - S4 Credit Equations and...

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www.mathsrevision.com S4 Credit Feb 13, 2012 Feb 13, 2012 Created by Mr. Lafferty@mathsrevision.com Created by Mr. Lafferty@mathsrevision.com Equations Equations and Inequations and Inequations Reminder of Solving Equations 1 Inequalities Reminder of Solving Equations 2 Equations with Fractions More Equations with Fractions Solving Inequalities

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www.mathsrevision.com S4 Credit Feb 13, 2012 Feb 13, 2012 Created by Mr. Lafferty@mathsrevision.com Created by Mr. Lafferty@mathsrevision.com Starter Questions Starter Questions Q1. Is the following true or false (A) (-3a)  x  5a = -15a    (B)   (-6x)  x  (-7y) =-42xy  Q2. Are the 2 answers the same ? (a) (-3h) 2  = (b) -(3d) 2  = Q3. Spilt £64 pounds into the ratio 7:9 Q4. Explain why 0.0675 is equal to 6.75 x 10 -2
www.mathsrevision.com S4 Credit Feb 13, 2012 Feb 13, 2012 Created by Mr. Lafferty@mathsrevision.com Created by Mr. Lafferty@mathsrevision.com Learning Intention Learning Intention Success Criteria Success Criteria 1. To remind pupils on how to solve  various types of equations 1. 1. Understand the process of solving  Understand the process of solving  equations using  equations using  “  “  the balancing method ” the balancing method ” Reminder on Reminder on Solving Equations Solving Equations

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www.mathsrevision.com S4 Credit 5(x - 3) = 25  5x Example 1 Feb 13, 2012 Feb 13, 2012 Created by Mr. Lafferty@mathsrevision.com Created by Mr. Lafferty@mathsrevision.com  - 15 = 25 Multiply out the bracket first  and then solve.  5x =  25 + 15  x =  40 ÷ 5 = 40 = 8 Reminder on Reminder on Solving Equations Solving Equations Substitute value into  original equation to  check answer
www.mathsrevision.com S4 Credit  6(x - 2)    =     3(x + 1)  6x Example 2 Feb 13, 2012 Feb 13, 2012 Created by Mr. Lafferty@mathsrevision.com Created by Mr. Lafferty@mathsrevision.com  - 12 = 3x = 3   + 3  6x – 3x -12 3x -12 = 3 3x = 3 + 12  3x  = 15  x  = 15 ÷ (3)  = 5 Solve as  normal Substitute value into  original equation to  check answer 18 18 Reminder on Reminder on Solving Equations Solving Equations

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www.mathsrevision.com S4 Credit -3(2 + 2y) = 6 – (y + 2)  -6 Example 3 Feb 13, 2012 Feb 13, 2012 Created by Mr. Lafferty@mathsrevision.com Created by Mr. Lafferty@mathsrevision.com  - 6y = 6 Equations and brackets Equations and brackets = 4 - y  - y  - 2  -6 – 6y -6 - 6y + y = 4 -6 – 5y  = 4  – 5y  = 10  y  = 10 ÷ (-5)  = -2 Tidy up  RHS Solve as  normal Substitute value into  original equation to  check answer 6 6
www.mathsrevision.com S4 Credit 13 Feb 2012 13 Feb 2012 Created by Mr. Lafferty@mathsrevision.com Created by Mr. Lafferty@mathsrevision.com Now try Ex 2.1 Ch5 MIA (page 99) Reminder on Reminder on Solving Equations Solving Equations

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www.mathsrevision.com S4 Credit Feb 13, 2012 Feb 13, 2012 Created by Mr. Lafferty@mathsrevision.com Created by Mr. Lafferty@mathsrevision.com
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## This note was uploaded on 02/13/2012 for the course MATH 115 115 taught by Professor Jones during the Spring '10 term at University of Phoenix.

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S4_3_Equations_Inequations_Ch5 - S4 Credit Equations and...

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