section 3.6 solving decimal equations mr. beltz & mr. sparks
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Section 3.6
Solving Decimal Equations
Mr. Beltz &Mr. Sparks
Goal: Find exact and approximate
solutions of equations that contain decimals.
Approximate: Near or close (estimate)
EX. $1.95 approx. $2.00
BasicsDistribute 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 = ?”
-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
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
Practice
P. 163 # 2-3
Show All work
USE YOUR NOTES AS A GUIDE
Practice P. 163 # 2-3
# 2: -1.40
#3: -1.12
Independent Practice
P. 164-165 #’s 4-8
SHOW YOUR WORK
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