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Section 3.6 Solving Decimal Equations Mr. Beltz & Mr. Sparks
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Goal: Find exact and approximate solutions of equations that contain decimals. Approximate : Near or close (estimate) EX. $1.95 approx. $2.00
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Basics Distribute on Both Sides First! Simply the expression (combine like terms) Goal: Get the variable to the left side Solve the Equation using Inverse Relationships Remember: You always want to solve for the Variable, “X = ?”
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-38x – 39 = 118 -38x + -39 = 118 +39 +39 -38x = 157 -38 -38 X = -4.13 Change Sub --> + Simply the Equation Do the Inverse of Addition [subtraction] The Inverse of Multiplication is Division
![-38x – 39 = x = x = X = Change Sub --> + Simply the Equation Do the Inverse of Addition [subtraction] The Inverse of Multiplication is Division](http://images.slideplayer.com/27/8960258/slides/slide_4.jpg "-38x – 39 = x = x = X = Change Sub --> + Simply the Equation Do the Inverse of Addition [subtraction] The Inverse of Multiplication is Division")
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24x + 43 = 66 -43 -43 24x = 23 24 24 X = 0.96 Change Sub --> + Simply the Equation Do the Inverse of Addition [subtraction] The Inverse of Multiplication is Division
![24x + 43 = x = X = 0.96 Change Sub --> + Simply the Equation Do the Inverse of Addition [subtraction] The Inverse of Multiplication is Division](http://images.slideplayer.com/27/8960258/slides/slide_5.jpg "24x + 43 = x = X = 0.96 Change Sub --> + Simply the Equation Do the Inverse of Addition [subtraction] The Inverse of Multiplication is Division")
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Practice P. 163 # 2-3 Show All work USE YOUR NOTES AS A GUIDE
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Practice P. 163 # 2-3 # 2: -1.40 #3: -1.12
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Independent Practice P. 164-165 #’s 4-8 SHOW YOUR WORK
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