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# Christian math[1]

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• In this example always the variable as X
• ### Christian math[1]

1. 1. SOLVING AN EQUATION CHRISTIAN TEKEU 8-9-2011 GRADE 7
2. 2. <ul><li>Go over solving equation </li></ul><ul><li>Know how to solve an algebraic equation </li></ul><ul><li>Explain how to write an equation </li></ul><ul><li>Check for the answer </li></ul>PURPOSE
3. 3. OBJECTIVE <ul><li>ASSIGN VALUES TO VARIABLE </li></ul><ul><li>Collect information about variable </li></ul><ul><li>Use the information to solve an equation. </li></ul>
4. 4. <ul><li>Variable + Number = Number or </li></ul><ul><li>Number = Variable + Number </li></ul><ul><li>X + 125 = 98 </li></ul><ul><li>98 =X +125 </li></ul>Standard equation
5. 5. <ul><li>Using the addition property. A=B </li></ul><ul><li>If you add C </li></ul><ul><li>on both side the equation remain the same </li></ul><ul><li>A+C=B+C </li></ul>HOW TO SOLVE AN EQUATION
6. 6. EXAMPLE #1 <ul><li>X+125=98 You want to find the variable X </li></ul><ul><li>You add -125 on both sides of the equation </li></ul><ul><li>X+125-125 =98-125 by solving you have: </li></ul><ul><li>X=-27 </li></ul><ul><li>Or 98=125+X the same procedure but the variable is on the right. </li></ul><ul><li>You will have -27=X </li></ul>
7. 7. EXAMPLE #2 <ul><li>X + 2 = 2/3 </li></ul><ul><li>Add -2 on both sides x+2-2=2/3-2 </li></ul><ul><li>x=2/3-2/1 then you have x=2/3-6/3 </li></ul><ul><li>x= -4/3 </li></ul>
8. 8. CHECK FOR THE ANSWER <ul><li>.Use the original equation to check the answer. </li></ul><ul><li>. Check for the equation balance. </li></ul><ul><li>Example: X + 125 =98 for X=-27 </li></ul><ul><li>Plot the value in the equation </li></ul><ul><li>you have -27+ 125= 98 </li></ul><ul><li>98=98 the equation is balance </li></ul>
9. 9. WRITING ALGEBRIC EQUATION <ul><li>Example #1 John has \$17 in his piggy bank, how money does he need to buy a game that cost \$87 </li></ul><ul><li>First name your variable before writing the equation. </li></ul><ul><li>Let represent the game by the variable n </li></ul><ul><li>n represents the amount of money needed </li></ul><ul><li>The algebric equation is: 17+n =87 </li></ul>
10. 10. EXAMPLE #2 Sentence Algebraic equation A number increased by nine is fifteen X + 9=15 Twice a number is eighteen 2X= 18 Four less than a number is 20 4-X=20 Rose is x years old. In thirteen years she will be twenty four years old X+13=24
11. 11. Closure <ul><li>Use addition property to solve an equation </li></ul><ul><li>The variable is positive </li></ul><ul><li>Write an algebraic equation </li></ul><ul><li>Check your answer </li></ul>
12. 12. Assignment <ul><li>students work in group. </li></ul><ul><li>*4x-3x+10=58 </li></ul><ul><li>*X+3=5-3/4 </li></ul><ul><li>*Suzy made a withdrawal from her saving account, her old balance was \$350,and her new balance is \$ 280 </li></ul><ul><li>*Thirty two is twice a number increase by 8 </li></ul><ul><li>*Twice a number, decreased by 29 is 7 </li></ul>